Ultimate kill

Naomi is a woman of many secrets. Her family has been murdered and she's been forced into hiding. No one knows her past or her real name. Jake, a former Marine and now working for CORE, a private criminal investigation agency, is in love with a woman who never existed. He's ready to leave her, until a madman begins sending her explosive messages. Innocent people are dying; the truth is thrust into the open. --Adapted from back cover description.