Boyden is shocked to discover that someone has been impersonating him, raiding illegal poker games and pocketing all the cash, and decides to go undercover as a punter to trap him. However, during the operation, the technology provided by the yard goes haywire and all of the suspects manage to escape without capture. Meanwhile, as the phony Boyden attacks and robs a prostitute, the real Boyden finds two Yardies on his case set out for revenge. As a second operation is organised, Boyden asks one of the players from the first game to go undercover and catch the fake police officers in the act. However, having gotten the Yardies on his side, Boyden organises sinister revenge for his fake counterpart.

Smithy and Rickman attend a break in at a primary school and find a seven-year-old boy looking for food. Further investigation reveals that the boy has been living alone for three days and his parents are nowhere to be seen. Interviewing the family's friends and relatives, Deakin discovers that it is very unlike the parents to just disappear without trace, and CCTV footage shows a van watching the family's house on the night of the disappearance. Blood found in the family bedroom indicates the parents may have been harmed, but Deakin is furious when a racial attack on the restaurant where the boy's father works is found to have been investigated by Smithy over a week previously.

Sun Hill police officers swoop into London's Chinatown to locate and arrest corrupt interpreter Mai Ann Wey. Desperate to make amends to Sgt. Sheelagh Murphy, PC Des Taviner manages to catch Mai Ann when she eludes the rest of the team. DC Mickey Webb is in turmoil after witnessing Supt. Adam Okaro having a friendly meeting with a suspected paedophile. Even a sceptical Insp. Gina Gold begins to have her suspiscions about Okaro when Webb sees him taking his own daughter to Gregory. Okaro is furious when Webb charges into a delicate covert op to ensnare Ron Gregory. Gregory is arrested, and the ""child"" in his boot is revealed to be civillian Front Desk Officer Roberta Cryer. Since there is so little evidence against Gregory, his solicitor demands his release. As Mickey drives Robbie home, they realise that Gregory's solicitor, Warren Napier, is in the paedophile ring as well. The pair break into Napier's house, and find a frightened little African girl in an attic room. As they try to es