A highway patrol trooper notices something strange on the side of the road: a homemade cross, fashioned as a memorial. But the date being 'remembered' is the following day - the day the police find a teenage girl, left for dead, in the trunk of a car.

Special Agent Kathryn Dance, kinesics expert with the California Bureau of Investigation, is on the case. The teenage victim points her to an online community where criticism is vicious. It looks as though one teen has finally snapped. Then further crosses appear. Now Dance must race against the clock to find the attacker before he can carry out his deadly plans for revenge... online and in the real world.