When Inspector Masters takes Edward Brannel to the river to question him about Sarah Quin's murder and to stage a reconstruction, Chief Inspector Moore arrives and makes a disparaging comment "tales of the bloody riverbank". This is an allusion to the Canadian TV series Tales of the Riverbank (1960), but this was not made until 1959 and was first shown on British TV in 1960, whereas the action in this story takes place in 1954.