Twins Aaron and Clive have been estranged for 40 years. Aaron still lives in the empty, crumbling tower block on the riverside in Deptford where they grew up. Clive is a successful property developer, determined to turn the tower into luxury flats. But Aaron is blocking the plan and their petty squabble becomes something much greater when two ghosts from the past - twins Annette and Christine - appear in the tower. At once, the desolate estate becomes a stage on which the events of one scorching summer are relived - a summer that shattered their lives, and changed everything forever. . .