Felicity Kendal stars as the mistress of Luke, played by Jack Galloway, who is married to Helen, played by Jane Asher.
It’s clear that nothing will break Luke’s marriage – but is he really enjoying the best of both worlds?
Luke is on dangerous ground, with both Maxine and Helen feeling they could do with a bit more attention.
Luke is in a turmoil when Maxine threatens to leave.
Luke arranges a free Sunday so that he can make things up with Maxine, but she has other ideas.
Luke realises that he must fulfil his promise to Maxine and spend a whole weekend with her.