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 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.
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.
A dead body washes ashore with only his head, hands, and feet exposed while the rest of his swollen body is encased in a coffin. The dead body belongs to a divorce lawyer with many people who did not like him, and an estranged wife.
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.
Dylan and Lizzie investigate deaths of three family members who were also business partners in a craft brewery. Also, Andy's legal expertise is needed when he and Dylan confront an issue in their adoption process, and Lizzie learns some hard truths about Julian's past.
Two passerby discover a severed head in a pond near a park. Dylan and Lizzie investigate and find there are three additional severed heads in the pond, but no sign of the bodies. The coroner finds that the heads were all put in the pond at different times, and further finds that all four of the heads have s specific chemical in them. Julian is asked to help with some computer investigation once the identity of the most recent head is known, This leads to a strange medical experiment and a possible mad scientist. Meanwhile, Dylan has a visit from someone from his past.