It ends with revelations

the long version

"During a summer festival in an English spa town Miles Quentin, a distinguished actor, and his devoted wife Jill become friendly with local MP Geoffrey Thornton, and his young daughters Robin and Kit. All of these attractive intelligent and busy people initially seem untroubled, but the surface of their lives conceals problems which come to light after the Quentins return to their London theatre world and the Thorntons to their Westminster home. This sets the scene for an unconventional love story in which loyalty may prove more important than love."--Publisher description.