With her son Edward (Tom Hiddleston) about to embark on a volunteer trip to Africa,doting mother Patricia (Kate Fahy) wants to give him a good send-off,and gathers her family together for a getaway to a holiday home on idyllic Tresco,one of the Isles of Scilly.Edward’s father’s attendance is eagerly anticipated,though sister Cynthia (Lydia Leonard) appears to be there unde...