England, 1926. Lady Isobel Farrar, an ageing widow with a colourful past, has returned home after years of living abroad. As she moves back into Halcyon Hill, her beloved country house, she finds herself dwelling on a long-buried secret. In the wake of a terrible tragedy when she was young, Isobel gave up a child for adoption, and now she can't help but wonder what became of him. Life has not been kind to Frank Brodie. Cruelly mistreated by his adoptive parents, he spent his young adulthood struggling to survive on the harsh streets of London, before the Great War took him away to the trenches. Now he has found safety with Arthur, an older man who loves and protects him. But something is still missing from Frank's life. When mother and son are finally reunited, will they be able to lay the past to rest?