Mathilda (Tilly), fourteen, and Ruth Anne (Roo), sixteen, are sisters and best friends in Connecticut, but when Roo crashes her car while texting she is confined to a hospital bed with "locked-in syndrome," aware of her surroundings, but apparently comatose--and Tilly must find a way to communicate with her sister, while dealing with her own sense of guilt.

"As Trent Zimmerman struggles to move past a traumatic event that took place several months earlier, he befriends class outcast Fallon Little, who helps him understand that he can move on"--

When her father is killed in a car accident, Lacey feels responsible, so when she is given a chance to make a difference in the lives of some of her fellow students, she jumps at the chance.

Set against the backdrop of the 1876 Centennial Exhibition in Philadelphia, Katherine cannot forgive herself when her beloved twin sister dies, and she feels that her only course of action is to follow suit.