No Love Lost - S15.E6

Boyden, Ashton and Santini head out for a night in a club, and Boyden bets his PCs that he can pull any girl in the club. Approaching an attractive young blonde, he ends up taking her home. The following morning, Boyden attends an assault on the girl's stepfather and discovers she is only 15. The case soon escalates when the girl's younger sister claims she has been abused by her stepfather's friend, and when Boyden's conquest runs away, she tracks him down and demands he provide her an alibi for the assault. When Boyden refuses, the girl is arrested for trashing a pub, and uses the interview to mention her night of illegal passion with the Sun Hill lothario. As CIB interview Boyden, Hagen is tasked with taking the girl to a children's home, but she cons her way out of the car and runs off. An off-duty Boyden then goes after the girl, but is unprepared for a discovery during his search.