Pearce and Deakin clash over conflicting information from their respective informants when both of them attempt to trap a gangleader dealing heroin. Whilst Pearce's latest informant, the Black Falcon, leads him right up the garden path, Deakin's information is paying off – until new information from Pearce's informant leads him and Deakin to an abandoned warehouse, where Deakin finds the lifeless body of his informant.