Sasha is faced with a dilemma when the investigation of a corrupt senior officer calls into question the conviction of Edward Monroe - whom she believes to be guilty of murdering her old work partner. Pre-empting an appeal, UCOS must carry out preliminary investigative work for Strickland. As things begin to look like someone else could be guilty of the crime in question, can Sasha hide a key fact from the team or will she do the right thing? Meanwhile, Steve is forced to finally face his past when his long-lost son Stewie unexpectedly turns up looking for a place to stay. However, father and son struggle to strike up a bond.