PCs Sheelagh Murphy and Leela Kapoor investigate a man accused of deliberately infecting women with HIV, and Leela suspects Sheelagh of racism when she makes a flippant remark about the relationship of the couple. PCs Lance Powell and Roger Valentine discover the decomposing body of a vagrant, identified as DC Jim Carver's ex-wife Marie. DI Neil Manson is forced to accept that his father-in-law, DAC Roy Pearson has been using the services of rent boys.