An Honest Lie by Tarryn Fisher

“I’m going to kill her. You’d better come if you want to save her.”

Lorraine—“Rainy”—lives at the top of Tiger Mountain. Remote, moody, cloistered in pine trees and fog, it’s a sanctuary, a new life. She can hide from the disturbing past she wants to forget.
If she’s allowed to.
When Rainy reluctantly agrees to a girls’ weekend in Vegas, she’s prepared for an exhausting parade of shots and slot machines. But after a wild night, her friend Braithe doesn’t come back to the hotel room.
And then Rainy gets the text message, sent from Braithe’s phone: someone has her. But Rainy is who they really want, and Rainy knows why.
What follows is a twisted, shocking journey on the knife-edge of life and death. If she wants to save Braithe—and herself—the only way is to step back into the past.

This seething, gut-punch of a thriller can only have sprung from the fiendish brain of Tarryn Fisher, one of the most cunning writers of our time.