A man's body washes up on the beach.It looks as if he threw himself from a lighthouse - but was it suicide, or something more sinister?Detective Inspector Berenice Killick is used to dealing with minor complaints like parking tickets and lost property, so when she is offered the case she jumps at the chance.She soon discovers that the dead man was Murdo Macguire, a physicist, and that he and his colleagues were carrying out top secret work on particle...