For her entire life, Melanie Landon has hidden the fact that her half sister, Ann, is a shape-shifter, determined to protect her from a world that simply wouldn't understand. When a mans hows up asking about Ann - who has been missing for months - Melanie fears the worst, and with good reason. Freelance writer Brody Westerbrook knows about the existence of shape-shifters and intends to include Ann in the book he's writing.

While Melanie is immediately drawn to the stranger she knows better than to trust him, and she denies his claim. But when Ann finally reappears, looking thin and sick, Melanie realises that exposure is the least of their worries. Protecting her sister has always been an enormous part of Melanie's life, but as Ann's health rapidly deteriorates, Melanie must come to grips with the fact that saving her may mean letting go . . .