The Co-Host

A gripping psychological thriller about obsession and lies

The rent was paid. The kitchen was spotless. The silence in the apartment felt heavier than it should.

Cassidy Rourke is a true crime podcaster chasing a story that could save her stalling career. But investigating the cold case of the "Phantom Killer" doesn't pay the bills, and she is drowning in debt. Enter Evelyn Hart. Evelyn is everything Cassidy is not: precise, quiet, and financially stable. She is an archivist who brings order to chaos. She pays two months' rent upfront. She organizes the mail. She even finds the research leads Cassidy missed. She seems like the perfect roommate.

But helpfulness blurs into control. Order shifts into surveillance.

Cassidy begins to lose track of small things—a coffee mug, a password, a conversation she doesn't remember having. The Wi-Fi network changes names. A private journal moves from a hidden drawer to a tabletop. The digital edges of Cassidy's life begin to fray, and the woman in the next room is always there, watching with a calm, unblinking focus.

What happens when the person rewriting your life knows your story better than you do?

Why This Psychological Thriller Will Hook You:

• A claustrophobic descent: Experience the terror of a home becoming a trap, where the locks on the doors are controlled by an app you can’t access.
• The ultimate gaslight: A chilling exploration of memory, identity, and what happens when your own voice is used against you.
• Visceral tension: A slow-burn nightmare that asks if we can ever truly know the people we let into our lives.

For Fans Of: The dark, twisted relationships of None of This Is True by Lisa Jewell, the domestic dread of The Housemaid by Freida McFadden, and the identity manipulation of Gone Girl.

"The scariest ghost stories are the ones written about you while you're still alive."

Who This Is For: Perfect for readers who crave unputdownable domestic suspense, unreliable narrators, and the terrifying realization that technology has made privacy a myth.

Content Note: Contains themes of severe gaslighting, stalking, and psychological manipulation.

Start reading now. Check your locks. Then check your search history.