Survival Instinct by Doranna Durgin
Karin Sommers' sister had died while helping Karin escape from the con man who'd trapped her. But Ellen wouldn't die in vain. Acting on instinct, Karin took over Ellen's identity and home - and thought she'd found a safe haven. Then PI Dave Hunter arrived, demanding Ellen's help, and Karin discovered that her sister had secrets of her own. With a missing boy's life at stake, could Karin fake her way one last time - and expose the truth about a deadly predator in a world where only the best liars survived?