Children often dream of discovering lost treasure. The dream becomes a reality when a mischievous nine year old boy called Peter, through a series of coincidences becomes tangled in the legacy of a deeply disturbing war time drama while on holiday in Norfolk during the summer of 1948. With the help of his school friend Andy and a girl called Meg they uncover the identity of a dangerous German spy and the discovery of a missing presumed dead Naval Commander and the recovery of valuable cache of diamonds.