Suspended from her normal duty, Officer Kate Benson is recruited by Special Unit Two (SU2) for a temporary assignment. Mature gargoyles that have been hibernating (on churches in Europe) have awoken and are collecting food (people) to feed to their eggs which have been incubating for 17 years. The victims are being kept alive until the eggs hatch. SU2 has 24 hours to track down the gargoyles and destroy the nest before the mass hatching occurs.

A Link is formed out of fat from liposuction patients from a plastic surgery clinic. The link kills the plastic surgeon when he gets in the way of the link's food supply and then disappears into the Chicago water system. The first detective on the scene is Rich Talridge, who was O'Malley's first partner before Nick was picked for SU2. Rich doesn't like that the case has been handed over to SU2 and tries to solve it himself which gets him in trouble. Kate and Nick and the rest of SU2 are left trying to track and get rid of the "Fat Link" before it kills again.