This five-part BBC drama is a seemingly simple story of a woman who suspects her husband of infidelity. But, being crafted by a playwright, Mike Bartlett, the straightforward premise is falsely disarming and is quickly exploited into a much more complicated and dark story.
The lead character, Gemma, is played to jaw-dropping perfection by Broadcasting Press Guild and BAFTA-winning actor Suranne Jones.
What did you think? Who should watch it?