“Harry meets Elena at the ballet but the Russian FSB are on her trail and Elena’s own son, Sasha, is forced to take deadly action to prevent his mother being revealed as a former Western spy.”

Episode 2 airs at 9pm on Sunday 25th September on BBC One.

> Order the Series 10 boxset on Amazon.

In this clip, the lives of MI5 assets are in danger when a laptop containing their identities is stolen…