A long-buried secret changes everything two sisters thought they knew about each other.

Franci and Lottie may be identical twins, but that’s where the similarities end. Franci has always been the stable one, while Lottie has bipolar disorder, constantly battling depression and mania. After years of taking care of her sister, Franci moves across the country to build a life for herself. Now, all the two share is distance.

But when Lottie gets in an accident, Franci reluctantly steps back into her familiar role as protector. She returns to find her sister’s life in complete disarray and makes a shocking discovery: Lottie has an infant daughter she never told Franci about. Although Franci swore she wouldn’t get sucked back in, she can’t leave the baby alone in Lottie’s care.

As Lottie further unravels, a secret is revealed that she has kept since childhood—one that has the power to reframe the sisters’ entire relationship, forcing Franci to ask herself if the secret was too much for Lottie to bear. Was the accident really an accident, and who has been protecting whom all these years?