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Dr. Zack Winston #3
Death Agent
They threatened his family. They invaded his hospital. Now this gifted ER doctor must safeguard the people he loves—before a deadly conspiracy claims them all.
Dr. Zack Winston has spent months helping his teenage daughter Annie piece her life back together after a conspiracy's brutal attack. But when a violent patient ambushes him in the ER, Zack senses the truth no one else wants to see—the danger that nearly destroyed them isn't done.
As the threats close in, Zack becomes fiercely protective of Annie and the colleagues who trust him with their lives. Yet the harder he tries to shield them, the more he risks pushing them away. When an assassin infiltrates his hospital, Zack realizes he's no longer battling for justice—he's fighting for survival.
With law enforcement stretched thin and the conspiracy closing ranks, Zack must rely on his medical instincts, his courage, and the fragile bonds holding his family together. But protecting the people he loves may demand a sacrifice he's not prepared to make.
Death Agent is the pulse-pounding third installment in the Dr. Zack Winston Medical Conspiracy Thriller series. If you crave high-intensity suspense, authentic medical risk, and a hero willing to walk through fire for his family and loved ones, you'll devour Mike Krentz's gripping psychological thriller.
Read Death Agent today—and dive into a story where love, loyalty, and survival are the only antidotes to terror.
Dr. Zack Winston has spent months helping his teenage daughter Annie piece her life back together after a conspiracy's brutal attack. But when a violent patient ambushes him in the ER, Zack senses the truth no one else wants to see—the danger that nearly destroyed them isn't done.
As the threats close in, Zack becomes fiercely protective of Annie and the colleagues who trust him with their lives. Yet the harder he tries to shield them, the more he risks pushing them away. When an assassin infiltrates his hospital, Zack realizes he's no longer battling for justice—he's fighting for survival.
With law enforcement stretched thin and the conspiracy closing ranks, Zack must rely on his medical instincts, his courage, and the fragile bonds holding his family together. But protecting the people he loves may demand a sacrifice he's not prepared to make.
Death Agent is the pulse-pounding third installment in the Dr. Zack Winston Medical Conspiracy Thriller series. If you crave high-intensity suspense, authentic medical risk, and a hero willing to walk through fire for his family and loved ones, you'll devour Mike Krentz's gripping psychological thriller.
Read Death Agent today—and dive into a story where love, loyalty, and survival are the only antidotes to terror.
279 pages, Kindle Edition
First published July 30, 2024
333 people are currently reading
55 people want to read
About the author
Mike Krentz
25 books111 followersMike Krentz writes medical suspense, psychological thrillers, and military fiction featuring complex characters and relationships.
Born and raised in Arizona, Mike earned a classical degree in English from the University of San Francisco, a Doctor of Medicine degree from the Medical College of Wisconsin, and a Master of Public Health Degree from Johns Hopkins University.
Following a civilian career as an emergency physician, Mike rededicated his professional life to serve America's Navy and Marine Corps heroes and their families, and to honor their sacrifices in defending our freedom and way of life. His last active duty assignment was as 7th Fleet Surgeon on board the flagship, USS BLUE RIDGE.
After retiring from the US Navy, Dr. Krentz continued his service as a consultant supporting the Navy and Marine Corps Public Health Center. Upon completion of that mission, he returned to his earliest life passion as a full-time writer.
Dr. Krentz sits on the Board of Directors of The Muse Writers' Center where he teaches fiction writing and participates in advanced studios.
Mike's fiction works include the DR. ZACK WINSTON SERIES of medical conspiracy thrillers, the MAHONEY & SQUIRE SERIES of military fiction, and a standalone psychological thriller, ANGELS FALLING.
www.mikejkrentz.com
www.facebook.com/MikeJKrentzAuthor
https://twitter.com/MikeJKrentz
https://www.instagram.com/mjkrentz/
Born and raised in Arizona, Mike earned a classical degree in English from the University of San Francisco, a Doctor of Medicine degree from the Medical College of Wisconsin, and a Master of Public Health Degree from Johns Hopkins University.
Following a civilian career as an emergency physician, Mike rededicated his professional life to serve America's Navy and Marine Corps heroes and their families, and to honor their sacrifices in defending our freedom and way of life. His last active duty assignment was as 7th Fleet Surgeon on board the flagship, USS BLUE RIDGE.
After retiring from the US Navy, Dr. Krentz continued his service as a consultant supporting the Navy and Marine Corps Public Health Center. Upon completion of that mission, he returned to his earliest life passion as a full-time writer.
Dr. Krentz sits on the Board of Directors of The Muse Writers' Center where he teaches fiction writing and participates in advanced studios.
Mike's fiction works include the DR. ZACK WINSTON SERIES of medical conspiracy thrillers, the MAHONEY & SQUIRE SERIES of military fiction, and a standalone psychological thriller, ANGELS FALLING.
www.mikejkrentz.com
www.facebook.com/MikeJKrentzAuthor
https://twitter.com/MikeJKrentz
https://www.instagram.com/mjkrentz/
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Displaying 1 - 19 of 19 reviews
February 18, 2025
ARC Review: Death Agent by Mike Krentz
Wow—Death Agent is an intense, fast-paced medical thriller that had me hooked from page one! Mike Krentz masterfully blends the high-stakes world of emergency medicine with the relentless danger of cartel revenge, creating a story that’s both gripping and emotionally charged.
Dr. Zack Winston is such a compelling protagonist. He’s not just a skilled ER doctor—he’s a father pushed to the edge, trying to protect his daughter while grappling with his own need for justice. The tension builds as the threats against him escalate, and I found myself completely invested in his moral struggle. Can he stay true to his oath as a healer, or will his thirst for vengeance consume him?
Krentz’s background as a physician really shines through, making the medical scenes feel incredibly real. The action is nonstop, the suspense is nail-biting, and the ethical dilemmas add so much depth to the story. I couldn’t turn the pages fast enough!
If you love medical thrillers with morally complex characters, intense action, and psychological depth, Death Agent is a must-read. I can’t wait to see what’s next for Dr. Zack Winston!
⭐️⭐️⭐️⭐️⭐️
Wow—Death Agent is an intense, fast-paced medical thriller that had me hooked from page one! Mike Krentz masterfully blends the high-stakes world of emergency medicine with the relentless danger of cartel revenge, creating a story that’s both gripping and emotionally charged.
Dr. Zack Winston is such a compelling protagonist. He’s not just a skilled ER doctor—he’s a father pushed to the edge, trying to protect his daughter while grappling with his own need for justice. The tension builds as the threats against him escalate, and I found myself completely invested in his moral struggle. Can he stay true to his oath as a healer, or will his thirst for vengeance consume him?
Krentz’s background as a physician really shines through, making the medical scenes feel incredibly real. The action is nonstop, the suspense is nail-biting, and the ethical dilemmas add so much depth to the story. I couldn’t turn the pages fast enough!
If you love medical thrillers with morally complex characters, intense action, and psychological depth, Death Agent is a must-read. I can’t wait to see what’s next for Dr. Zack Winston!
⭐️⭐️⭐️⭐️⭐️
August 6, 2024
Put your seatbelt on!
Another electrifying, twisting, and fast-paced thriller of a story by Mike Krentz. I appreciate how the he artfully provides the reader a refresher about what happened in Books 1 and 2 in a way, and at the right time, that amplifies the ongoing story throughout Book 3.
While the experiences and ordeals of Dr. Zack Winston, his family members, his friends, his medical colleagues, and law enforcement — and even his enemies — may seem daunting to some, one only has to view news sources to know that these types of tragedies — by terrible villians — that promote real-life heroes happen, and maybe more often than we we may wish to admit.
It makes me grateful for my quiet life, but it makes me appreciate and admire how the author is able to weave such an intricate and suspense-filled story. Wow!
And, the end of the story left me eagerly searching for — and anxiously awaiting — Book 4!
Another electrifying, twisting, and fast-paced thriller of a story by Mike Krentz. I appreciate how the he artfully provides the reader a refresher about what happened in Books 1 and 2 in a way, and at the right time, that amplifies the ongoing story throughout Book 3.
While the experiences and ordeals of Dr. Zack Winston, his family members, his friends, his medical colleagues, and law enforcement — and even his enemies — may seem daunting to some, one only has to view news sources to know that these types of tragedies — by terrible villians — that promote real-life heroes happen, and maybe more often than we we may wish to admit.
It makes me grateful for my quiet life, but it makes me appreciate and admire how the author is able to weave such an intricate and suspense-filled story. Wow!
And, the end of the story left me eagerly searching for — and anxiously awaiting — Book 4!
March 31, 2025
I received an ARC through "Booksirens" and I am voluntarily leaving an honest review.
This story begins with Annie, Dr. Zack Wilson's daughter, in the hospital following an abduction and attempt on her life. Zack and his ex-wife are waiting for Annie's release. Zack wants her to remain, but Natalie, the ex, wants to take her back to Calif. The next day Annie is released and Annie decides that she wants to stay with Zack. Later, the people who abducted Annie show back on the scene and want to finish getting rid of Annie, Zack and two others.
Read along and learn why this group wants to get the 4 people, why Annie was originally abducted, what the group was that was following the 4 individuals. The ending will answer any questions that you have.
Any great read by this author, don't miss out!
This story begins with Annie, Dr. Zack Wilson's daughter, in the hospital following an abduction and attempt on her life. Zack and his ex-wife are waiting for Annie's release. Zack wants her to remain, but Natalie, the ex, wants to take her back to Calif. The next day Annie is released and Annie decides that she wants to stay with Zack. Later, the people who abducted Annie show back on the scene and want to finish getting rid of Annie, Zack and two others.
Read along and learn why this group wants to get the 4 people, why Annie was originally abducted, what the group was that was following the 4 individuals. The ending will answer any questions that you have.
Any great read by this author, don't miss out!
February 1, 2025
Death agent
This whole series is awesome! I know how Zack feels. After I had children I used to think if anyone harmed my kids in any way,I would kill them a my bare hands! Thank GOD that never happened but their is truly a special bond that you have w your kids that makes you feel capable of anything in order to protect them. Not saying it is right but I do understand. I hope there will be a 4th book so we can see how Zach deals a therapy!
This whole series is awesome! I know how Zack feels. After I had children I used to think if anyone harmed my kids in any way,I would kill them a my bare hands! Thank GOD that never happened but their is truly a special bond that you have w your kids that makes you feel capable of anything in order to protect them. Not saying it is right but I do understand. I hope there will be a 4th book so we can see how Zach deals a therapy!
August 3, 2024
Disappointing ending. Otherwise the novel was a terrific read and I highly recommend it.
The novel was a terrific read and I highly recommend it. Perhaps the author will consider revising the ending at some point in the future.
The novel was a terrific read and I highly recommend it. Perhaps the author will consider revising the ending at some point in the future.
January 18, 2025
I have zoomed through this series as each book kept me on my toes. Unless there is a book 4 in the makings, the ending was awful. Really!? Besides that, the 3 books were amazing reads with twists and turns on every page.
September 1, 2025
Good book
I think I'm hooked on Dr wins tons series . I am still debating if he should have taken the deal or not. Was Sarah going to attack him and Anne or, just run, or was Sarah doing a suicide by Zack? Well guess we will never know.
I think I'm hooked on Dr wins tons series . I am still debating if he should have taken the deal or not. Was Sarah going to attack him and Anne or, just run, or was Sarah doing a suicide by Zack? Well guess we will never know.
December 23, 2025
This was a very intense story. I have read the whole series and enjoyed every book. If you enjoy mystery and suspense, and a lot of twists and turns, you will enjoy this series and I highly recommend it.
I received an ARC from BookSirens and I am leaving this review voluntarily.
I received an ARC from BookSirens and I am leaving this review voluntarily.
January 10, 2026
Excellent series
The Zack Winston series is excellent. Proofread is necessary. The story is very intriguing. The details appear to be well researched. Krentz has done well keeping characters true throughout the series. I can't wait to read the next one.
The Zack Winston series is excellent. Proofread is necessary. The story is very intriguing. The details appear to be well researched. Krentz has done well keeping characters true throughout the series. I can't wait to read the next one.
August 7, 2024
A few things didn’t quite add up for me in this third novel and although I did enjoy it I probably would give it a 3.5 stars.
November 16, 2024
2.75 stars. Would make a pretty good TV movie complete with drug cartels unable to successfully execute victims (really?!) and cheesy dialogue.
December 14, 2024
Not as good as the first two, but worth the read.
January 16, 2025
This is more of a crime thriller than medical thriller, but that doesn't mean I'm not looking forward to the next Zack Winston book, as this one ended on a cliffhanger to say the least!
April 11, 2025
Book was ok. Too much emotional drama for me.
June 20, 2025
⭐️ 3.5/4 stars ⭐️
July 19, 2025
Great Read
Looking forward to
Mike’s next book, and Dr. Winston’s adventure. I’m sure the characters will have plenty of stories for me.
Looking forward to
Mike’s next book, and Dr. Winston’s adventure. I’m sure the characters will have plenty of stories for me.
August 2, 2025
suspenseful
Fast and furious reading. Always in favor for the good guy but not always possible. This book in a great exciting series.
Fast and furious reading. Always in favor for the good guy but not always possible. This book in a great exciting series.
October 2, 2025
First two books were better. This one got kind of out there and was a little two unbelievable.
December 1, 2025
Last part a little ridiculous to believe, Zach and daughter going to Good House. I almost didn't finish the book
Displaying 1 - 19 of 19 reviews