Episode 4 airs at 9pm on Sunday 9th October on BBC One and sees a controversial religious leader send two recently released inmates on a revenge suicide mission. Meanwhile, a startling attempt is made on Elena Gavrik’s life and Harry’s suspicions about CIA deputy-director Jim Coaver are compounded.

> Read our exclusive interview with the show’s writers.

> Order the Series 10 boxset on Amazon.

Watch BBC One’s new Series 10 trailer…