In this episode, DI Sleet is joined by TV presenter Dermot O'Leary. Our detectives learn that Amanda Holden, the mayor's PA, has been murdered. Mayor Simon Cowell has been kidnapped and is being held to ransom. Forensic pathologist Lana Del Rey shows them the body and Dermot takes note of any clues that might help them solve the case.

Dermot is put through his paces as he and Sleet meet three suspects:

Miley Cyrus - who runs Successville's nursing home. Sleet and Dermot go undercover as prospective residents to try and look for clues. Miley was upset that Cowell was going to run a bypass through the nursing home, but was that motive enough for murder?

Jessie J - martial arts expert and Sleet's old sensei, Jessie invites the detectives into her dojo to find Dermot's 'spirit animal' and meditate. It becomes clear that Jessie hates technology, probably because the mayor was going to knock down her dojo to put up telephone towers. Was this reason enough for Jessie to take things into her own hands?

Alan Sugar - owner of Successville's sweetshop, Alan is down on his luck after Cowell sent the health and safety inspectors around to inspect his shop. Was Alan unhinged enough to resort to murder and kidnapping to try and save his store?

After meeting all three suspects, Dermot and Sleet get a tip-off that Cowell has been moved, and they only have minutes left before Cowell is blown to pieces. They learn that to diffuse the bomb they must type in the name of the kidnapper. Has Dermot seen enough to get it right? Have you been paying attention? Did you spot enough clues to work out who killed Amanda Holden and kidnapped the mayor?

In this episode, DI Sleet is joined by Olympic gymnast Louis Smith. The detectives learn that pharmacist Lindsay Lohan has been spray-tanned to death. She is the latest victim in a spate of murders - it looks like the detectives have a serial killer on their hands. Forensic pathologist Richard Hammond shows them the body, and Louis takes note of any clues which might help them solve the case.

Smith is put through his paces as he and Sleet meet three suspects:

Vladmir Putin - local gym owner who loves working out with the boys. Vlad talks the talk, but did he have anything to do with the bodies found in his steam room?

Kim Kardashian - convicted psychopath Kim has already killed five people for being prettier than her, but did she have anything to do with the recent spate of killings?

Russell Brand - local purveyor of bric-a-brac and host of the Successville Beauty Pageant, but does Brand know more about the murders than he's letting on?

After meeting all three suspects, it's time for Louis to decide - who killed Lindsey Lohan? As ever in Successville, it's a matter of life and death as Louis attempts to catch a killer. Have you been paying attention? Did you spot enough clues to work out who the killer was?