Instinct

Dylan and Lizzie investigate the murder of a successful businesswoman who attempted to prolong the lifespan of humans. Also, Dylan and Andy look to continue their adoption search, and Detective Ryan Stock (Travis Van Winkle) from Nebraska arrives to hunt for a potential serial killer.

Dylan and Lizzie investigate the murder of an aspiring musician who was gunned down on a roller coaster at an amusement park. Also, Lizzie exhausts herself trying to keep up with a newly single friend, and Andy and Dylan look to broaden their options for adoption.

Lizzie and Dylan work a case that provokes deep emotions for them when a 9-year-old boy goes missing on the eve of a judge's decision in a bitter custody battle. Also, with Dylan's help, Lizzie confronts some of her past childhood demons, and a major advancement presents itself in Dylan and Andy's adoption search.

A Sweet 16 celebration turns into a crime scene when the birthday girl's stepmother falls to her death and the guests and staff are put under a microscope by the NYPD. Also, Ryan finds a new lead in his investigation, and Lizzie receives some positive news at the precinct.

Dylan and Lizzie investigate the case of a prominent divorce lawyer who is found murdered in a bizarre ritual. Also, Dylan and Andy hit a bump in their adoption process; Lizzie and Julian reach a tough point in their relationship; and Ryan Stock's serial killer case escalates.

Dylan and Lizzie investigate when a street artist's work is found with a victim's body in the middle of it. Also, Ryan catches a suspect in the Sleeping Beauty Killer investigation and Dylan's new book editor, Harry Kassabian (Eric Bogosian), pays him a visit.

Dylan and Lizzie go undercover in New York's erotic underworld when they investigate the murder of a high-powered public relations rep. Also, a glamorous love from Julian's comes back into his life with a proposal he can't resist.

Dylan and Lizzie work to uncover why an Olympic-hopeful figure skater is killed while on the ice. Also, Ryan's case heats up and lands him and Dylan in unusual circumstances and Julian comes to understand why an old acquaintance has returned to New York.

It's all hands on deck to track down the Sleeping Beauty Killer when Ryan and Dylan's biggest lead in the case takes them to a face off aboard a ship. Also, Dylan receives troubling news from his father.

Dylan and Lizzie work to uncover why an Olympic-hopeful figure skater is killed while on the ice. Also, Ryan's case heats up and lands him and Dylan in unusual circumstances and Julian comes to understand why an old acquaintance has returned to New York.

A gruesome discovery in a city pond leads Dylan and Lizzie to investigate a young man's murder, while Andy rescues one of Dylan's students from a legal bind, on the series finale.