The murder of an NYPD detective brings Nichols and Stevens to a sleepy seaside town, ruled by one of Nichols’ old foes – an Irish mob boss with a reputation for eluding justice.

The detectives find themselves in the cutthroat world of professional ballet as they investigate the murder of the star ballerina at a conservatory.

A body that's been decapitated, initially thought to be a mob hit, leads Detectives Nichols and Stevens to an escort service and the financial would-be gods who utilize it.

A psychologist conducts unimaginable field experiments asking his human test subjects to make the impossible choice, but Detectives Nichols and Stevens are even more surprised by the man's inspiration.

Detectives Nichols and Stevens investigate a nurse and the men who love her while looking into the death of a woman who was treated in the emergency room shortly before she was murdered.

Four men who have been friends since high school discover they're being blackmailed over the death of another childhood friend. When one of the four turns up dead, it's up to Nichols and Stevens to uncover the truth behind a 22-year-old mystery.

The murder of a magazine editor reveals his predilection for young girls, leaving Nichols and Stevens investigating not only his staff, but a Russian prostitution ring.

A new murder fits the style of a serial killer who was executed months earlier. Stevens must figure out if the killing is a copycat crime or if she helped convict an innocent man.

The body of a bright young college student is found completely drained of blood. What appears to be a sex game gone wrong leads to a world of underground clubs, blood dealers, and a fanatical cult who believe themselves immortal.

While investigating the murder of a food truck business owner, Nichols and Stevens uncover evidence of an affair and a possible larger scandal involving a New York senator.

A government official blackmails two doctors for overcharging patients before he is killed. The doctors have another secret to protect, however, and worry that someone will find out mobsters financed their practice.

Nichols takes a very personal interest in a case that turns out to have many layers when an old friend is murdered, and somehow the reclusive book dealer's troubled daughter is also involved.

A boxer's career is derailed when authorities discover he leads a dog fighting ring.

Nichols reaches out to his father for assistance when he and Stevens are assigned the case of a real estate agent who has been murdered.