The Last Mrs Summers

When Lady Georgiana Rannoch's dearest friend, Belinda, inherits an old cottage in Cornwall, she happily joins her in inspecting the property. But when they arrive at the cottage, it is completely uninhabitable. Luckily the friends meet Rose Summers, who Belinda knew as a child. Rose invites them to stay at an estate now owned by her husband, Tony. Belinda confesses that she never liked Rose and had a fling with Tony years ago, but beggars can't be choosers. But the increasingly awkward visit turns deadly, when a member of the household is found murdered and all clues point to Belinda.