Last Call: A Sloane Merritt Missing Persons Thriller Book 4

by M.K. Quinn

A missing college student. A dark riverbank. A mystery that begins with one last walk into the night.
When twenty-two-year-old Layon “LJ” Price vanishes after a night out near the Chattahoochee River, police assume the a drunk college kid, a dark riverbank, a tragic accident.

But LJ’s father isn’t convinced. And neither is private investigator Sloane Merritt.

Four days missing. No body. No witnesses. Just a bar fight, fractured relationships, and a final glimpse of LJ walking into the night.

As Sloane digs deeper, the timeline begins to fracture. Security footage reveals blind spots. Witnesses remember shouting—but no splash. And every answer seems to raise a more dangerous question.

Did LJ fall? Did he run? Or did someone make sure he never made it home?

Meanwhile, a long-silent witness in Eden Pike’s disappearance finally steps forward—bringing Sloane closer than ever to the truth she’s been chasing for twenty years.

Last Call is Book Four in the gripping Sloane Merritt Missing Persons Thriller series—perfect for fans of twisty investigations, emotional suspense, and mysteries that don’t let go.

264 pages, Kindle Edition

Published March 21, 2026

About the author

M.K. Quinn is a Georgia-based author, armchair detective, and lifelong observer of the shadows between ordinary life and the mysteries that lurk beneath it. A self-professed missing-persons obsessive, she has spent years studying real cases, investigative techniques, and the emotional toll of unresolved disappearances—passions that fuel every page of the Sloane Merritt Missing Persons Series. When she’s not writing twisty, character-driven thrillers, M.K. lives in Atlanta with her endlessly supportive husband and their three mischievous cats, who firmly believe they’re her true co-authors. The Sloane Merritt Series is her debut, marking the beginning of a dark, compelling universe built for readers who love smart heroines, layered mysteries, and stories that refuse to let go.

Reviews

[Danielle · Rating 5 out of 5]

Last Call was another great book. Sloane is making progress on her best friend's disappearance and is asked to find a 22 year old college student. The Sloane Merritt Missing Persons series has been a wonderful gift that has made me a forever fan. The team of Sloane, Theo Calder and Ash Patel are a great investigation trio, that tracks down missing persons. They are characters that get you involved in the process and keep you intrigued and captivated until the end of the book. The stories all play with emotion and a need to complete the investigation.

This was a complimentary ARC copy that I reviewed voluntarily.

[Maureen Miller · Rating 4 out of 5]

Last Call by MK Quinn is a tightly plotted missing persons thriller featuring the sharp and determined investigator, Sloane Merritt. Quinn crafts a fast-paced narrative filled with suspense, clever twists, and authentic investigative detail. Sloane’s tenacity and complexity make her a compelling lead, while the story’s escalating tension keeps readers engaged until the final page. This is a must-read for fans of contemporary detective fiction and those who appreciate a strong female protagonist at the heart of the mystery.

Thank you, BookSirens, for the ARC. I am leaving this review voluntarily.

[Kelly · Rating 4 out of 5]

I received an advance review copy for free, and I am leaving this review voluntarily.

I felt this book was predictable but the last half had a few twists where I had no idea where the author was taking it. Sloane is a very likeable character however L.J., who disappears, become a character that even though he was missing, I was not hoping as much for him. He was not a character that I found likeable the more that the book went on.

This author just loves cliffhangers though and rolling into the next book….so I want to read the next book NOW! :)

[Cameron · Rating 5 out of 5]

M.K. Quinn has quickly become my new favorite author. Last Call is a slightly harder read than the first few... but for the best reasons! The mystery keeps you guessing and I feel so invested in the cases. I can't wait to read what Sloane, Ash and Theo are up to next. And OMG what will we learn about Eden next!!

[Brittany Goodwin · Rating 5 out of 5]

This is such a fabulous series and this book doesn't disappoint. Fans of the shoe DISAPPEARED on ID Channel will find this series like a novel version of the show! Realistic cases that keep you guessing. Great work. **I received an ARC and am leaving this review voluntarily**

[Fatima Salih · Rating 4 out of 5]

I enjoyed reading this. The story was easy to follow and from the first until the last page, it kept me on my toes, especially when we found out what happened to LJ Price.

I received an advance review copy for free, and I am leaving this review voluntarily.

[Farah Rk · Rating 4 out of 5]

I received the ARC for the Last Call. It was a well-paced mystery that seamlessly blends investigation with suspense from beginning to the end.

[Debra Bradford · Rating 4 out of 5]

Loved Every One

I can't wait for the final book! Loved the series so much!!! M.K. Quinn has become one of my favorite authors.