Nash and company, along with Jake Cage, catch three escaped convicts to save the SIU. Harvey has fathered a child with Anna; Evan cheats on Cassidy; Nash and Caitlin finally consummate their relationship.
In the Season 4 finale, Nash tries to recapture three escaped convicts, but undercover cop Jake Cage (Stone Cold Steve Austin) also wants the cons and wants Nash off the case; Cassidy has second thoughts about marrying Evan; Harvey threatens to take his ex-girlfriend, Anna to court to find out whether he fathered her son.—hamidryazdani