The Best Episodes Written By Julian Simpson

MI5 investigates the assassination of a Muslim cleric outside the high court, and uncovers a radicalised Christian who is determined to incite a religious war.

The team find themselves at the centre of a shocking cover-up.

UCOS reinvestigate the death of a wealthy financier when a psychic tells the dead man's daughter that she needs to resolve some unfinished business on her father's behalf. Deeply sceptical of Sebastian Carter's 'gift', the team set out to prove him a fraud, but Pullman struggles to dismiss him as a con man when he reveals a conflict involving her own late father.

The team reinvestigate a 30-year-old safety deposit robbery, and they soon find themselves being drawn into a case involving police corruption that threatens the future of the UCOS itself.

The team become concerned that undercover police operations may have been compromised when the body of a computer expert who worked with the Met turns up under a false name at a teaching hospital.

As Lane comes to terms with life after UCOS, Esther asks him to help one of her book club friends find her missing brother - but will his nose for the truth get him into further trouble? And how will his former colleagues cope without their most dogged sleuth?

Tension mounts as Ned and Sasha are forced to work together when the body of a film critic found in a sewer is thought to be linked to the 20-year-old murder of a concept artist, David Straka. As the team interview Straka's contemporaries, groupies and assistants, looking for possible connections between the deaths, they find themselves immersed in the macabre world of the occult. And Griffin's expert knowledge of the history of London and in particular the hidden Fleet River, proves invaluable.