When Kate, single mother and law firm partner, gets an urgent phone call summoning her to her daughter's exclusive private school, she's shocked. Amelia has been suspended for cheating, something that would be completely out of character for her over-achieving, well-behaved daughter.

Kate rushes to Grace Hall, but what she finds when she finally arrives is beyond comprehension.

Her daughter Amelia is dead.

Despondent over having been caught cheating, Amelia has jumped from the school's roof in an act of impulsive suicide. At least that's the story Grace Hall and the police tell Kate. In a state of shock and overcome by grief, Kate tries to come to grips with this life-shattering news. Then she gets an anonymous text:

Amelia didn't jump.

The moment she sees that message, Kate knows in her heart it's true. Clearly Amelia had secrets, and a life Kate knew nothing about. Wracked by guilt, Kate is determined to find out what those secrets were and who...