Natalie Collins always has a plan.

Her troubled younger sister Kit rarely does.

Until Kit finds Wisewood, a secretive self-help retreat on a secluded Maine island. It promises you'll leave a better, braver version of yourself.

But why does it forbid contact with the outside world? Why are there no testimonies from previous guests? Natalie fears it is some kind of cult.

Then, after six months of silence, she receives an email from Wisewood:

Would you like to come tell your sister what you did - or should we?

Who is digging into the sisters' past? How did they discover Natalie's secret? A secret that will destroy Kit.

She has no choice but to go to Wisewood, to find out if this place of healing has more sinister motives.

But as she's about to discover, Wisewood is far easier to enter than to leave . . .