Which Sister: A Psychological Thriller

by Jack Dane

Both had a reason…but which sister killed him?

Judith, the younger Rose sister, has always been more successful. After marrying Mark, her sister Katie’s former husband, she finally has it all. The perfect job, apartment, and relationship. The perfect life…until secrets about Mark come to light. Secrets worth killing over.

Katie couldn’t be a more total opposite. After her alcoholism ended her marriage, her life began to spiral. And when Mark seeks full custody of their young daughter, Katie has nothing left to lose.

So when Mark goes missing in Central Park, all eyes turn to the Rose sisters. Both have a reason to kill Mark–and both have something to hide.

As the police begin to dig into the sisters and their bitter feud, two facts become Someone is guilty, and no one can be trusted.

Only one question remains…which sister is a killer?



Fans of Freida McFadden, Daniel Hurst and Kiersten Modglin will be utterly glued to the pages as twist after twist is delivered until the mind-bending final reveal that’ll have you gasping out loud.

Genres: Thriller, Fiction

250 pages, Kindle Edition

Published November 7, 2025

Reviews

[Matt · Rating 4 out of 5]

Jack Dane impressed me with a recent short story, so it felt only fair to tackle one of his full-length novels. This psychological thriller was exactly what I needed to get my mind spinning.

Of the two Rose sisters, Judith has always been the more successful. Younger by a few years, she knows what she wants and makes sure she gets it, most notably by marrying Mark, her sister Katie’s former husband. At first, everything appears to be going smoothly, until a faint sense of unease settles in and subtle truths begin to surface.

Katie, by contrast, is barely holding herself together. Her emotional anchor is Amelia, the five-year-old daughter she shares with Mark. Amelia is what keeps Katie going, so when Mark and Judith announce their intention to seek full custody, Katie is pushed to the brink. She is determined to keep her daughter in her life, no matter the cost.

When Mark suddenly goes missing in Central Park, both sisters have compelling reasons to want him dead—making them equally viable suspects in the eyes of the police. With persuasive motives and mounting evidence on both sides, the central question becomes unavoidable: which Rose sister is the killer? Dane masterfully turns the story on its head for the attentive reader.

I particularly enjoy psychological thrillers that move briskly, only to deliver a well-timed twist, and Jack Dane does this exceptionally well. The narrative develops smoothly, fueled by strong ideas and propelled by short chapters that create a steady rhythm. Just as everything seems settled, the truth emerges and derails all expectations. While no one could truly see it coming, careful readers will appreciate the trail of clues laid out before revelation becomes unavoidable.

The characters are well crafted and serve the story beautifully. Dane shapes the Rose sisters in sharp contrast to one another, making their differences impossible to ignore and encouraging readers to form strong allegiances. As the story unfolds, Mark’s presence looms larger, driving tension and forcing both women into increasingly desperate positions. Each has reason to want him gone, yet both claim innocence, leaving the reader guessing as subtle hints and character flaws gradually reveal the truth.

A successful psychological thriller demands momentum, and Jack Dane delivers on all fronts. He spins a story that seems to be moving confidently in one direction, only to reveal that everything has been unfolding along a very different path. Just when the reader believes they have the answers, another revelation upends those assumptions. Discovering Mark’s fate—and determining which Rose sister belongs behind bars—requires careful attention, but the payoff is more than worth it. This is a masterful read, and I will gladly be seeking out more of Jack Dane’s work as I add him to my list of authors to follow.

Kudos, Mr. Dane, for a gripping thriller that left me in awe.

Love/hate the review? An ever-growing collection of others appears at:
http://pecheyponderings.wordpress.com/

[Lindsay Shaw · Rating 5 out of 5]

Great thriller! Definitely kept me interested and maybe im a newbie to Jack Dane, but I didn't see the ending. another great read from Jack and will definitely read more of his!

[Lauren Speringo · Rating 2 out of 5]

Between 2 and 3 stars. It wasn’t a badly written book it was just…missing something. And I’m not sure what. Too much internal monologue. I found myself skimming most of the second half. The twist was revealed in the last 10 percent of the book and while I didn’t see it coming, it wasn’t worth the wait.

[Sandy Verschoore · Rating 1 out of 5]

Which Sister

The kind of book you can just skim and understand. Lots of yabber, yabber repetition. Murdered? They never said a body was found.

[Melissa Kirkman · Rating 3 out of 5]

Which Sister by Jack Dane is a psychological thriller. Two sisters - but which one did it?? This is a twisty family drama which will keep you guessing. Katie's alcoholism ensures that she is isolated in this book which gives it a 'no one to trust, not even myself vibe' which can be very unsettling. While I enjoyed this book, its not one of my favourites. I would still recommend to psychological thriller fans as it was easy to read and a page turner. It just didn't stick with me after the fact.

Thanks to Netgalley and the publisher for this ARC in return for an honest review.

[Kathy · Rating 1 out of 5]

I didn't like any of these characters - Katie, Judith or Mark. This was so repetitive. I was skimming chapters. Katie's part was particularly repetitive. She kept going over the same thing again and again. Then when you find out what really happened, it was a real stretch to believe it. The whole story was pretty unbelievable. Katie is married to Mark. She has a drinking problem. Mark leaves her and the marries her sister, Judith. Judith kept saying how she hated Katie. I would have thought it was Katie who hated Judith.

[Rita Batra · Rating 3 out of 5]

A fast, messy thriller about two rival sisters, a missing husband, and a lot of secrets. I flew through this short read and liked the constant twists and shifting suspects, even if the beginning felt slow and a bit repetitive. I did see the ending coming but the final reveal still made it worth it. Entertaining, just not as shocking as I expected. 3.5 /5

Thanks to the publisher and NetGalley for the ARC.

[Beleisha Bernhardt · Rating 4 out of 5]

"Which Sister" was a great, short read. Jack Dane did a great job of writing a story that left open enough possible twists that you were never quite sure which directions it was going to go while wrapping it all up nicely at the end.

Thank you Netgalley and Jack Dane for this ARC. All thoughts and opinions are my own.

[Diane · Rating 4 out of 5]

SPOILER ALERT!!!! Very unique

Really thought I had it at the beginning after you didn't know who did it. The mother is the only thing I didn't catch. still a great book. A little heavy on the mental issues but I understand why.
They always referred to murder, but without a body I highly doubt Judith would have been thrown in the slammer so fast.
Will read others by Jack.

[Amanda Lopez · Rating 3 out of 5]

3.5 🌟

This book was a great, short but fast-paced thriller that did its job! There was plot twists sprinkled out that you weren’t sure which direction it was going to until the very end, which honestly caught me by surprise. Jack Dane is a new author that I will definitely be reading more books from!

A big thanks to NetGalley and Jack Dane for the opportunity to read this ARC.

[Joann Sledz · Rating 5 out of 5]

Edge of Your Seat

A man his present wife her sister his ex wife
equals trouble but add in his girlfriend equals
murder
Lies and deception of one man make this a
thriller you won't forget
The ending is a shocker
You will be kept in suspense from cover to cover
I highly recommend
Five stars plus
Teenage to senior read

[Hope Noar · Rating 5 out of 5]

Wonderful book with a great twist

All I can say is WOW! Just when you think you have figured things out, something else happens. The bond of sisters is very close, no matter what occurs. And I felt compassion for the little girl who was confused about what was going on. This book definitely kept my interest. I highly recommend reading it.

[Nicole Collins · Rating 5 out of 5]

This book was s good I read it in 2days I was not expecting the who at all that took me by surprise for sure.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Mandi Dawes · Rating 5 out of 5]

I never have read anything by this author before but I liked this book. The plot was great and the book was page turner. Another sit and finish before you do anything else type of book.

I received a free copy of this book via Booksprout and am voluntarily leaving a review.

[Mindy · Rating 4 out of 5]

Someone online recommended this book and it was fairly short, so I said "why not?" This was a new author for me and his writing style was quick and easy. There was suspense throughout and I didn't see the ending coming. 4 solid stars.

[Terry · Rating 4 out of 5]

Good but not my fave

Another good, fast read but a little disappointing. Hate it when the villain is an out of the blue character ... but Jack pulled it off with the final twists. I didn't love it but I didn't hate it either.

[Janae’ Shannon · Rating 5 out of 5]

I’m reading this and thinking oh I know who killed him, but as I keep reading I’m like yeah no way.. wouldn’t have guessed that. I love his quick paced writing and shocking twists that I didn’t see coming at all.

[Joy Shannon · Rating 5 out of 5]

YES!!!!

As usual, this is one of Jack Dane’s best. I read it in less than 24 hours; although I have read most of his books that way. I did not know how it would end until I got “there.” My goodness. Read it, you will be so glad you did. Way to go Jack Dane!

[hannah · Rating 3 out of 5]

i was into this book ??? like genuinely enjoying it and then the ending happened and it just… no

the ending felt cliche and kinda ruined it for me. it could’ve been really good but it just wasn’t at the end

i don’t regret reading it but yeah. liked it until i didn’t

[Betty · Rating 5 out of 5]

You Only Think You Know the Killer.

An entertaning read though some of the killers plot seem a tad over the top. I figured outt who d8d 50 % into it, by 75% changed my mind. At85% finally got it.

[Lauri R · Rating 5 out of 5]

Great Book!

I love Jack Dane’s style of writing. Which Sister was suspenseful with plenty of twists. I look forward to Dane’s next release.

[Allison Singleton · Rating 3 out of 5]

i really enjoyed the ending and surprise that came with it. i do feel like these books are a little amateur. not the biggest fan of the story leading up to the ending.

[Barb · Rating 4 out of 5]

Wow what an ending.

[Amanda Hopper · Rating 3 out of 5]

3.5

[iris muller · Rating 4 out of 5]

Pretty good book I like how fast paced it was!

[Amber · Rating 5 out of 5]

Absolute must read you will never see the ending coming.

[Linda · Rating 4 out of 5]

Definitely keeps you turning the pages.

[Annette Yednak · Rating 5 out of 5]

This is a good one !

This book just moved into my top 10 favorites for Psych Thrillers ! It's a don't hesitate just read - kind of read !

[Caitlin Bunting · Rating 4 out of 5]

Another solid thriller from this author. This one was fast paced and kept me hooked throughout. A nice twist that tied the book together. Highly satisfied with this one.

[Kayla Chard · Rating 3 out of 5]

3.5 ⭐️