Starring BAFTA nominated James Norton (Happy Valley, A Little Life), BAFTA nominated Niamh Algar (Mary and George, The Virtues), Olivier nominated James McArdle (Sexy Beast, The Mare of Easttown) and BIFA nominated Jessica Brown Findlay (The Flatshare, Downton Abbey).

Living a waking nightmare, Pete (James Norton) and Maddie (Niamh Algar) are jettisoned into the world of the other couple; Miles (James McArdle) and Lucy (Jessica Brown Findlay). At first it seems all four are agreed on a solution, but it soon becomes clear that hidden motives are at play. How far can each couple trust the real parents of their child – or even each other? As Pete and Maddie are stretched to breaking point, they realise they will stop at nothing to keep their family together.