Roger and Lance discover the decomposing body of a vagrant on some wasteground, but despite extensive investigation, fail to identify the victim, until fingerprint analysis reveals it to be none other than Jim's ex-wife, Marie. Sheelagh and Leela investigate a case of criminal damage, prompting to Colin voice his opinions on inter-racial relationships. However, the case soon escalates when the accused claims that her ex-boyfriend has deliberately infected her with HIV. Leela soon suspects that Sheelagh's aggressive attitudes towards the suspect may be a result of racial prejudice. Meanwhile, Neil confronts his father-in-law over allegations made by Ravi Shah.
