The Darkness of Evil | Karen Vail Novel Series #7 | A Book by Alan Jacobson

The Darkness of Evil

Now Available

The latest installment in the award-winning, critically acclaimed Karen Vail series from USA Today bestselling author Alan Jacobson features esteemed FBI profiler Karen Vail on the hunt for an escaped serial killer…

A Closer Look

Karen Vail Series

Karen Vail is no ordinary FBI agent.

She’s a profiler, brought to life by Alan Jacobson’s seven years of unprecedented access to, and research with, the FBI’s Behavioral Analysis Unit. The Karen Vail series has been raved about by reviewers, readers, law enforcement officers of all stripes, real FBI profilers…and even one of the legendary founding fathers of the Behavioral Analysis Unit in Quantico.

View All Karen Vail Novels

OPSIG Team Black Series Novels

America’s safety is on the line!

Missions the United States government cannot sanction–or acknowledge–fall under the purview of OPSIG, the Operations Support Intelligence Group, run out of a secret office in the basement of the Pentagon.

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Alan Jacobson

Meet Alan Jacobson

I’m often fascinated by how and why things happen—and how chance meetings and random occurrences, years later, can have an enormous impact on one’s life. There are many such examples to choose from, but I’ll share two with you because of the impact they had on my writing career.

Read more about Alan

Crush trailer

​Karen Vail returns in Crush, which brings the esteemed profiler to the Napa Valley. Join Alan as he introduces us to the second Vail installment while on location where the novel takes place: the Napa County Sheriff’s Department, the county morgue, the wineries that appear in Crush—and the wine cave where one of the victims is found…

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Inmate 1577 trailer

Watch the book trailer for Inmate 1577, the fourth novel in the Karen Vail series, featuring photos and videos from Alcatraz and San Francisco. ***** click on image to view video ***** Check out Alan's other book trailers and author interviews, including four with FBI...

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Author Magazine interview

Alan sat down with Author Magazine in Seattle after the launch of The 7th Victim. In this interview, he provides tips for aspiring writers, some background on his writing method, and the creative process. ***** click on image to view video ***** Check out Alan's other...

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FBI Profiler Mark Safarik & Author Alan Jacobson (Part 2)

FBI profiler Mark Safarik interviews Alan Jacobson about the Karen Vail novels, where the idea behind the Crush killer came from, the research he did with the "real" Karen Vail, SSA Mary Ellen O'Toole, and more. Watch part two below: Watch part three of the Mark...

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FBI Profiler Mark Safarik & Author Alan Jacobson (Part 4)

In part four of the interview between FBI Profiler Mark Safarik and Author Alan Jacobson, Mark talks about what it's like sitting across the table from a serial killer. He also explains his work with the Vidocq Society and Forensic Behavioral Services International....

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Recent Books by Alan Jacobson


The Darkness of Evil | A new novel by Alan Jacobson

The Darkness of Evil (Karen Vail #7)

The latest jaw-dropping thriller from USA Today bestselling author Alan Jacobson, featuring esteemed FBI profiler Karen Vail, on the hunt for an escaped serial killer …

Spectrum, a book by Alan Jacobson

Spectrum (Karen Vail #6)

Authoritative, compelling and crisp, Spectrum moves with a velocity that seems to make the pages turn themselves.

The Lost Codex | A novel by Alan Jacobson

The Lost Codex (OPSIG Team Black #3)

From the first page, you know you’re in the hands of a storyteller at the top of his game: The Lost Codex has nonstop action, living-breathing characters, rich detail …”

No Way Out | A novel by Alan Jacobson

No Way Out (Karen Vail #5)

“Jacobson mixes rocket-paced suspense with fascinating history in this thrill ride of a book.”

Hard Target | A novel by Alan Jacobson

Hard Target (OPSIG Team Black #2)

An enigmatic covert operative. A skilled FBI agent with a dark past. And a terror plot unlike any in history.

Innmate 1577 | A Novel by ALan Jacobson

Inmate 1577 (Karen Vail #4)

“Inmate 1577 is another rippin’ good ‘Alan Jacobson read’! Jacobson researches his books like a good newspaper reporter, and then pushes the envelope …”

Stand Alone Thrillers and Short Stories

False Accusations | A stand alone thriller by Alan Jacobson

False Accusations

“Alan Jacobson has crafted a riveting story with a truly frightening villainess. This is a terrific book!”
John Saul, New York Times bestselling author

Double Take | A stand alone Short Story by Alan Jacobson

Double Take

“Alan Jacobson writes with a sure hand, a strong voice, and a fine eye for detail.”
– Ridley Pearson, New York Times bestselling author

Fatal Twist | A stand alone Short Story by Alan Jacobson

Fatal Twist

“Karen Vail is a knockout, tough and brilliant.”
– Tess Gerritsen, New York Times bestselling author & creator of Rizzolli & Isles TV series

Our Blog


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Evil Exposed

The Darkness of Evil: what happens when a daughter discovers her dad is a serial killer? A couple of years ago I started wondering what it would be like for a daughter to discover that her father is a heinous murderer of women. What would she feel? Denial? Or a sudden...
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Drop that weapon! You’re on Candid Camera

With the recent spate of clashes between law enforcement officers and citizens, many civil rights experts have stated that the outcome of the police investigation would’ve been different had the defendant possessed a video recording of the encounter. On the surface,...
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Elmore Leonard

“Hey. Can I share something with you?”   Writing dialogue takes years of practice. I developed the ear during an experimental theater workshop during my English undergraduate studies at Queens College (that’s Queens as in New York, not England). My professor,...
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Tracking license plates: no outrage?

In an almost prescient news story, it was disclosed this week that US citizens have been tracked using license plate data by private companies. As I stated in my earlier blog post regarding former NSA contractor Edward Snowden, the metadata collected by the NSA for...
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