What do you think?


Quint Adler #7
Persona Non Grata
Persona Non Grata
is Quint Adler's most tumultuous case yet. A close friend of Quint's is murdered and he agrees to investigate it, not knowing just how depraved the case will become. After discovering a second - and then third - murder, Quint knows he should bow out, but he's too far entrenched to turn back now. It may prove fatal for our beloved Quint.
- GenresThriller
276 pages, Kindle Edition
Published May 18, 2023
About the author
Brian O'Sullivan
20 books1,580 followersLibrarian Note: There is more than one author in the GoodReads database with this name. See this thread for more information.
Ratings & Reviews
Friends & Following
Create a free account to discover what your friends think of this book!
Community Reviews
Displaying 1 - 24 of 24 reviews
May 21, 2023
This Author has a unique style mixing humor and homicide and it works perfectly!
While these books (series 1-7) can be read as standalone and be quite enjoyable,
I recommend reading the series in order. The books take place in locales well
known to the Author and for fun I looked up some of the places and they are exactly as described -you can visit them if you know where they are located. The fictitious
Newspaper, where Quint no longer works, is still pretty much as it would have been back in the day. The trouble Quint continues to attract, because he does look for it,
is always because he has a very tightly wound moral compass.- he probably ought
to have been a cop, but he’s a brilliant, if not slightly awkward and well meaning
PI instead . So prepare for a ride follow this current situation and hold on tight!
While these books (series 1-7) can be read as standalone and be quite enjoyable,
I recommend reading the series in order. The books take place in locales well
known to the Author and for fun I looked up some of the places and they are exactly as described -you can visit them if you know where they are located. The fictitious
Newspaper, where Quint no longer works, is still pretty much as it would have been back in the day. The trouble Quint continues to attract, because he does look for it,
is always because he has a very tightly wound moral compass.- he probably ought
to have been a cop, but he’s a brilliant, if not slightly awkward and well meaning
PI instead . So prepare for a ride follow this current situation and hold on tight!
December 23, 2024
Read all of the Quint series and even all of Brian’s books. They are all worthy!
February 6, 2026
Great read
I really enjoyed this installment of the Quint Adler series! It had great character development and a great plot. I’m excited to read more of the series!
I really enjoyed this installment of the Quint Adler series! It had great character development and a great plot. I’m excited to read more of the series!
September 24, 2024
persona non grata
I did it! So far I’m done with this series and excited for the newest and I believe the last of Quint to come out in December!
I did it! So far I’m done with this series and excited for the newest and I believe the last of Quint to come out in December!
October 2, 2023
I must start this review off with a shout out about the author, Brian O'Sullivan. Brian has written 11 novels and 1 short story. I have read several authors in 3 different genres and every once in awhile even your favorite author writes a dud.:-) But, I have to say EVERY book Brian has written is a 5 star read. If you are not familiar with this author, check him out. You will not be disappointed. Now, the review. "Persona Non Grata" is book 7 of the Quint Adler Thriller series. In previous books in the series Quint is always smack in the middle of the drama, some of which he creates. In "Persona Non Grata" nothing has changed, the drama he is in is on steroids. One of his dear friends is murdered. Even though he has not been hired to investigate the murder, he jumps in head first, pro bono. As with all the cases he has been involved in, it is a roller coaster ride. All the feels are there, murder, suspense, romance, humor and omg all the twists and turns. I would say I can't wait to read Brian's next book, but I am currently reading it "The Mastermind". So whatever the next book is, I'm there.
November 6, 2024
Dare I give another 5-star review to author Brian O'Sullivan?! Like his character, Quint, I dare! And in this penultimate book in the Quint Adler series, Quint is quite daring. Quint is a character you will love from the beginning, and that stays true throughout the series. In this book, he jumps right in when the investigation is about the murder of a very close friend (d*mn you again, Brian). He doesn't care what it takes or who's cage he rattles, he is going to get to the bottom of this mystery. From beginning to end, the story was phenomenal, and I can't wait for the final book in the series (coming December 2024).
June 6, 2023
A style of his own. #11th in the Quint Adler series. In this book Quint bounces from P.I. to news reporter. Quint started out as a reporter for the Walnut Creek Times newspaper. We are in sunny California. Quint goes to visit an old friend only to find him dead. He decides to investigate the murder. Soon more people are murdered and Quint himself is shot.
June 6, 2023
Another edge of your seat adventure
The Quint Adler series never disappoints. They are a gradual build to a "can't put the book down" conclusion. Persona Non Grata did not disappoint. I hope Mr Sullivan keeps writing adventures for Quiet ... And us.
The Quint Adler series never disappoints. They are a gradual build to a "can't put the book down" conclusion. Persona Non Grata did not disappoint. I hope Mr Sullivan keeps writing adventures for Quiet ... And us.
July 4, 2023
Entertaining as usual
Entertaining a usual! This time I really enjoyed the ending. You pulled it all together nicely. One of my favorite books of yours. Going on to the next book now. Keep writing please.
Entertaining a usual! This time I really enjoyed the ending. You pulled it all together nicely. One of my favorite books of yours. Going on to the next book now. Keep writing please.
July 25, 2023
Great book and series. I have read each of the 7 books so far in this series and enjoyed every story. Lot's of action and suspense. Great endings which leave me wanting more. Hope there is an 8th book in this series
April 27, 2024
Brilliant
I loved all the Quint Alder book. They twist and turn,leaving the reader guessing into the last stroke of the pen. Excellent stuff,
Mr . I Sullivan.. Thank you for your books
I loved all the Quint Alder book. They twist and turn,leaving the reader guessing into the last stroke of the pen. Excellent stuff,
Mr . I Sullivan.. Thank you for your books
April 8, 2026
My heart was racing reading this! Another 5 star book from Brian O'Sullivan! This books has tension and humor, something rare in thriller books! Great plot. Faced paced. Perfect chapter length! Can’t wait for the next!
May 28, 2023
Another great read by Brian O’Sullivan
Book seven of the Quint Adler thrillers. Great character development. Great plot. You won’t want to put it down. Can’t wait for # 8.
Book seven of the Quint Adler thrillers. Great character development. Great plot. You won’t want to put it down. Can’t wait for # 8.
September 2, 2024
Quint did it again
Kept me on the edge of my seat again. So glad I came upon this author. Can't wait to read more of his books.
Kept me on the edge of my seat again. So glad I came upon this author. Can't wait to read more of his books.
September 3, 2024
What a thriller
Each book keeps getting better and each has different plots but they are so gripping I can’t stop reading!! I’m enjoying the ride.
Each book keeps getting better and each has different plots but they are so gripping I can’t stop reading!! I’m enjoying the ride.
December 19, 2024
Just when I think this series can't get any better...it does! What crazy things Quint Adler gets himself into. I am going to be so sad when this series is over. One more book to go....
January 10, 2025
I liked it. Didn’t love it like the other Quint stories. Lots of moving parts.
April 9, 2025
Another great case solved by PI Quint Adler. Looking forward to the next in the series!
June 7, 2025
persona non grata
As usual, the Quint series does not disappoint. I loved all of these stories. They seem So real. They are hard to put down.
As usual, the Quint series does not disappoint. I loved all of these stories. They seem So real. They are hard to put down.
June 16, 2025
It took me a while to get into this one. Quint's adventures are starting to all feel similar. But the last 20% of this book was excellent!
February 17, 2026
Another great Quint book. Largely finished it in 2 days. Love Quint and his girlfriend and friends - such likable characters
June 22, 2026
One more in the series. Well worth the read.
September 20, 2026
A great read as always
Displaying 1 - 24 of 24 reviews











