When Robin Maudsley receives an unexpected call from an heir hunter in 2012, he is drawn into the extraordinary afterlife of his cousin Max — William Maxwell Nasmyth Wilcock — a man who vanished for years at a time, carried concealed weapons with diplomatic immunity, held passports from multiple nations, and moved in circles no ordinary British citizen could explain. From a possible connection to the Cambridge Five, to a royal stamp from King Hussein of Jordan, to photographs taken inside a restricted Soviet Red Square, the evidence Robin pieces together is as baffling as it is compelling. Part family memoir, part detective story, Was My Cousin a Triple Agent? is a fascinating and unresolved mystery — the story of a man who lived many lives and left behind just enough clues to suggest that the truth may never fully be known.