A young musician finds himself locked inside a gas station bathroom in the middle of the night by an unseen assailant, caught between the horrors on the other side of the door and the horrors rapidly skittering down the walls inside.

Profoundly devastating... and nasty as hell. -Eric LaRocca, author of Things Have Gotten Worse Since We Last Spoke

Nat Cassidy, author of the acclaimed horror Mary, returns with When the Wolf Comes Home, an unabashed, adrenaline-fueled pop horror thriller where the darkest fears can become reality.

This is the kind of great, big, epic horror novel we got back in the '80s that came out swinging for the fences and left everything on the field. Welcome back, you shaggy, bloody monster of a book!--Grady Hendrix

The Stephen King of TikTok--The Lineup

The 25 Best and Most Anticipated Horror Books of 2025--Men's Health
Most Anticipated Horror of 2025--Paste Magazine, LitHub

One night, Jess, a struggling actress, finds a five-year-old runaway hiding in the bushes outside her apartment. After a violent, bloody encounter with the boy's father, she and the boy find themselves running for their lives.

As they attempt to evade the boy's increasingly desperate father, Jess slowly comes to a horrifying understanding of the butchery that follows them--the boy can turn his every fear into reality.

And when the wolf finally comes home, no one will be spared.

Other Books by Nat Cassidy
Mary, an Awakening of Terror
Nestlings

Nat Cassidy's highly commercial, debut horror novel Mary: An Awakening of Terror, blends Midsommar with elements of American Psycho and a pinch of I'll Be Gone in the Dark.

Best Horror of 2022--Esquire, Paste Magazine, CrimeRead

Harper's Bazaar 15 Best Books for Spooky Season
The Lineup Best Debut Horror Novels of 2022
American Writers Museum--Staff Recommendation

Mary is a quiet, middle-aged woman doing her best to blend into the background. Unremarkable. Invisible. Unknown even to herself.

But lately, things have been changing inside Mary. Along with the hot flashes and body aches, she can't look in a mirror without passing out, and the voices in her head have been urging her to do unspeakable things.

Fired from her job in New York, she moves back to her hometown, hoping to reconnect with her past and inner self. Instead, visions of terrifying, mutilated specters overwhelm her with increasing regularity and she begins auto-writing strange thoughts and phrases. Mary discovers that these experiences are echoes of an infamous serial killer.

Then the killings begin again.

Mary's definitely going to find herself.

Nat Cassidy is at his razor-sharp best again with his horror novel Nestlings, which harnesses the creeping paranoia of Rosemary's Baby and the urban horror of Salem's Lot, set in an exclusive New York City residential building.

Best Adult Books 2023--New York Public Libary
NPR Books We Love 2023
Best Horror of 2023--Esquire, Den of Geek
Best Horror of 2023 (Honorable Mention)--Paste

Ana and Reid needed a lucky break.

The horrifically complicated birth of their first child has left Ana paralyzed, bitter, and struggling: with mobility, with her relationship with Reid, with resentment for her baby. That's about to change with the words any New Yorker would love to hear--affordable housing lottery.

They've won an apartment in the Deptford, one of Manhattan's most revered buildings with beautiful vistas of Central Park and stunning architecture.

Reid dismisses disturbing events and Ana's deep unease and paranoia as the price of living in New York--people are odd--but he can't explain the needle-like bite marks on the baby.

Other Books by Nat Cassidy:
Mary: An Awakening of Terror

When M and G move into a new apartment, they think they're finally getting the fresh start they both so desperately need. Unfortunately, the previous tenant wasn't quite ready to leave, and he's about to teach them the horrifying lengths someone will go to keep things from changing.

about the playwright:

Cassidy has a] formidable gift with language.
Show Business Weekly

Cassidy] has a free-flowing imagination and] an uncanny ability to do what a great composer like Verdi once did--make a visceral connection to his own time.
Terry Ponick, The Washington Times

Nat Cassidy is obviously a talented...writer
The Village Voice

Cassidy's writing is so sharp that he] holds one's attention like a vise. ...Anyone who appreciates theater that aims at both the head and the gut will appreciate his work]. And it will haunt you for days to come.
James D Watts, Jr, Tulsa World

Cassidy brings] together everything audiences could want in a play.
Kristen Torres, Loyola Phoenix