You'll Never Know I'm Here by Kiersten Modglin

They tell the world what mysteries to read.
Soon, they'll be caught up in one of their own.
When six book influencers take a weekend getaway to connect with their fellow creators, it's meant to be a chance to relax, collaborate, and discuss all of the books they love.
But from the start, something's clearly amiss. From the host's mysterious absence and an unexpected guest to an odd occurrence in town and the strange and worrisome behavior of the neighbors, what starts out as an innocent and lively vacation quickly becomes a weekend filled with terror. And when one of the group members believes they see something horrifying at the house next door, their carefully laid plans begin to unravel.
Drawn into a mystery that runs far deeper and is more sinister than they could've imagined—and surrounded by those who refute their story—the group struggles to unearth the truth about the house and the couple next door before it's too late.
As new questions and shocking revelations surface, the group must decide if they can trust each other—not only with their safety in the house, but with their lives entirely.
Readers' worst nightmares come to life in this terrifying new thriller that tests the limits of friendship, explores the power of social media influence, digs into the depths of trust, and examines the desperate and dangerous lengths of obsession from million-copy bestselling author, Kiersten Modglin.