Bel, Freddie and Hector verge on breaking the biggest corruption expose ever - a house of cards stretching across London's most influential men - but things get complicated when one of them becomes the centre of a tabloid sex scandal. As they battle against high-level cover-up, Freddie's quest for a controversial contributor takes him right into the lion's den.

• Abi Morgan

• Ben Whishaw
• Juliet Stevenson
• Hannah John-Kamen