Two sisters bound by a secret that could tear them apart . . .

Rosy is the responsible one, well-behaved and organized. Amy is the free spirit, never following the rules. But despite their differences, they can never break loose from each other.

Because only they know what happened that day years ago. Because only they know that one wrong move could destroy them both.

But when Amy's new psychiatrist attempts to dig into her past, he begins to suspect something is amiss between the sisters. His gut tells him to run, but his own dark history draws him ever closer to the two women . . . and they to him.

As cracks form in the sisters' carefully constructed façade, one thing becomes clear: three's a crowd, and one of them has to go.