When Pixie Tate is summoned to the wild Cornish coast to unravel a curious mystery at the stately St Sidwell Manor, she knows that something quite extraordinary must be hiding in its shadows. Over 100 years ago, in the dark of night, a child vanished from his bed never to be seen again - and Pixie must now discover the truth of those final moonlit hours. As she loses herself in the past, secrets are revealed, love affairs exposed and, ultimately, Pixie will be forced to make a devastating choice that will change her life forever.