The team's hunt for a vengeful serial killer takes an unexpected turn when a missing person resurfaces and a new case emerges.

Ironside's team investigates a string of heists at high-stakes underground poker games. Meanwhile, Teddy and Virgil's working relationship strains the investigation, threatening everyone's safety.

Ironside and his team, including Virgil, Holly and Teddy race the clock to clear the murder of a New York University honor student, before a plea bargain will set a hit man free. In the process, Ironside seeks Gary’s expertise, but being back in that mindset could prove too much for him to handle.

What started as a wild rooftop chase quickly turns into a homicide investigation when the team discovers severed body parts in a garbage bag. When additional victims surface across the city, Ironside, Holly, Teddy and Virgil track the case that leads to the doors of a notorious motorcycle gang and a femme fatale.

Ironside is forced to come to terms with a mistake that has haunted him for years; Virgil must recover from a violent incident.

When a student from the wrong side of the tracks is kidnapped off a bus, it becomes apparent to Ironside and the team that the wrong kid was snatched. The race to rescue the hostage leads to a ransom payment of rare comic books and a teenage computer whiz. Meanwhile, through flashbacks, Ironside rekindles unpleasant memories from the past involving his father.

Fleet Week in New York City goes awry when two marines and a seaman find themselves on the run after a pimp and prostitute wind up dead. As the team races to find the soldiers before a vicious street gang does, Ironside finds himself at odds with Capt. Rollins, who is grappling with demons of his own time in Iraq.

A car bombing leaves two people dead and the FBI singles out a problematic Columbia student as the suspect. However, Ironside’s suspicions fall elsewhere and a deadly game of cat and mouse lands himself and the team at risk when the bomber strikes again.