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Out of Print · Quinn Adler Book 2 · September 18, 2026

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The Adler Files · Dark academia thrillers

The Quinn Adler Thrillers

Some confessions aren't whispered. They're shelved.

A true-crime podcaster finds murder confessions penciled into the margins of library books. Then they start predicting deaths that haven't happened yet.

Book 1 free with Kindle Unlimited  ·  Book 2 out Sept 18

★★★★★ Calling this a thriller is an understatement. Nicole Mason · Amazon reviewer
Episode Zero: The Case That Started It All — cover Out of Print — cover Marginalia — cover
Witness statements

Readers can't put it down

What readers are saying about Marginalia on Amazon.

Statement 01★★★★★
Calling this a thriller is an understatement. This book will grasp hold of you and it doesn't let go.
Nicole Mason · Amazon reviewer
Statement 02★★★★★
Fantastic! This was a fast moving, action packed, thinker of a page flipper. It has the chapter enders that make you have to continue reading.
LaurScho · Amazon reviewer
Statement 03★★★★★
It starts strong and keeps you hooked all the way through. Quinn Adler is a great main character—smart, determined, and easy to like. … By the end, I definitely wanted to jump straight into the next one.
MissNadia · Amazon reviewer
Statement 04★★★★★
The POV heroine isn't perfect—far from it. She messes up, makes mistakes, falls to hubris. She isn't the brilliant mastermind detective; she's human. That's what makes her relatable, and real.
Amber · Amazon reviewer
Statement 05★★★★★
An addictive Dark Academia thriller. … Smart, tense, and impossible to put down.
Maria · Amazon reviewer
Statement 06★★★★★
It's a fascinating, detailed, and engrossing story about a podcasting criminology grad student with an eye for the smallest details and a personality that won't back down. Highly recommend!
C. Randolph · Amazon reviewer
Read every review on Amazon →

Excerpts from customer reviews of Marginalia on Amazon.

The case files

Reading order

Start with the free prequel or jump straight into book one. Either way, the network is already watching.

File 00 FreeEpisode Zero cover

Episode Zero

Prequel short story

A girl, twenty, missing eight years, and one word on her file: voluntary. The case that started the podcast.

Read it free
File 01 Out nowMarginalia cover

Marginalia

Book 1 · Kindle Unlimited

A confession in a library book, signed with a tiny closed eye. It matches a real killing. The next one hasn't happened yet.

Get it on Amazon
File 02 Sept 18Out of Print cover

Out of Print

Book 2

Six months later, a podcaster in Pittsburgh sends Quinn a cold case and a confession in the margin. It should be a copycat. It isn't.

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Files 03–05 Sealed

Books 3–5

In the works

A five-book series, and the network is bigger than one campus. Join the list and you'll hear first.

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Episode Zero: The Case That Started It All — an Adler Files prequel by Maren Blackthorn
Free prequel · No signup

Episode Zero is free

Twenty years old. Gone eight years. Officially, she left.

Before the downloads and the evidence board, Quinn Adler was a grad student with a borrowed microphone and a missing-persons file nobody else would open. This 7,500-word prequel is the case that started it all, and it reads in one sitting.

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Evidence item 001

The first recording

The opening of Episode Zero, before Quinn Adler had a show, a name, or any idea what she'd started.

Raw audio · Take eleven 01:32

QUINN: "Here's what nobody tells you about disappearing.

You think it takes something dramatic. A struggle. A stranger. A van with no plates and a story that ends up on a podcast like this one. But the most efficient way to erase a person isn't violence. It's a word. The right word, typed into the right field on the right form, by someone with somewhere else to be.

In Bree Sandlin's case, the word was voluntary.

Twenty years old. Gone eight years. And for eight of those years the official answer to the question — what happened to her — has been a checkbox. She left. People leave. The file was effectively closed before anyone bothered to open it.

I want to talk about who gets to be looked for. And who gets a checkbox instead.

My name is Quinn Adler. This is — well. We hadn't named it yet."

I stopped there because that was as far as I'd gotten.

It was the first thing I ever recorded — the whole of it, a minute and a half of me talking into a headset microphone I'd unplugged from a gaming setup I no longer owned, in a bedroom that doubled as my entire apartment, at an hour when reasonable people were asleep. There was no Focusrite yet. No evidence board, no red thread, no two million downloads, none of the apparatus I'd eventually wrap around this thing until it became the load-bearing wall of my life. There was just me, twenty-one years old, six weeks into a criminology master's I'd talked my way into mostly so I could keep standing close to the kinds of questions nobody else seemed interested in asking.

Let me back up. Six weeks earlier.

Keep reading — it's free

Then pick up the thread in Marginalia.

Persons of interest

Who's in the room

The Listener

Quinn Adler

True-crime podcaster. Brilliant, impulsive, and incapable of letting a story go. She chases the truth long past the point of safety.

The Counterweight

Dev Okafor

Quinn's producer and best friend, and the steady voice of caution behind the mic.

The Skeptic

Det. Ray Sandoval

The homicide detective who sees Quinn as a podcaster playing cop. The lawful path she keeps refusing.

The Intern

Marisol Reyes

The eager undergrad who idolizes Quinn, and always seems to be first to turn up the next clue.