In London, the Metropolitan Police set up a new Unsolved Murders Unit --- a cold case squad --- to catch the criminals nobody else can. In Geneva, millionaire art collector Miles Faulkner --- convicted of forgery and theft --- was pronounced dead two months ago. So why is his unscrupulous lawyer still representing a dead client? On a luxury liner en route to New York, the battle for power within a wealthy dynasty is about to turn to murder. And at the heart of all three investigations are Detective Chief Inspector William Warwick, rising star of the department, and ex-undercover agent Ross Hogan, brought in from the cold. But can they catch the killers before it’s too late?