An investigation of a liquor store robbery takes an unexpected turn when one of the gang members claim they are being protected by ""The Walrus"", a corrupt cop. Harris suspects that the Walrus is the Head of Armed Robbery, Geoff Skinner. When Megan Walsh reveals that Skinner is her old friend and mentor, Harris begins to suspect that she may tip Skinner off, and his suspicions are heightened when Megan starts asking him questions about the case after seducing him. Meanwhile Katherine suffers an extreme bipolar episode and Harris is forced to confront the fact that their relationship is at breaking point. Katherine leaves for a posting in WA, leaving Harris shattered. (thetvdb.com)