Kick the Ballistics

Plot:

Student Jane Herzfeld was fatally shot with the Glock service pistol stolen from Detective Ryan by serial killer 3XK. Her ex-boyfriend, Finn McQueen, has an alibi. Phone records show she was in contact with undercover narcotics Detective Seth Carver. He had forced her to inform on Chinese mob boss Clifford Lee by acting as a tutor to his son, Ben. Castle ingeniously finds some missing links through prison records.