Smith and Young attend a call to a burglar seen attempting to gain access to a houseboat, but their arrival sparks the assailant into falling into the fast flowing river, forcing Smithy to jump in after him. A woman then arrives at the station to make a complaint of rape against the assailant. Meanwhile, Tait and Kent find a man badly injured after falling from the roof of a disused warehouse. Their investigations lead them to discover the organised crime of 'tramp bashing', where professionals pay tramps sums of money to beat the hell out of one another. However, they soon discover that the fights are a decoy for a money laundering operation, involving the proceeds of a rather impetuous drug smuggling operation.
