BS Moreton has a perfect life. Archivist to the Earl of Duntisbourne, he is admired by his colleagues for his intellect and steely morality, but when Sam Westbrook arrives from the British Museum to create a new exhibition from a unique hoard of erotic artefacts, he is appalled, believing the collection will corrupt the minds of the visitors to Duntisbourne Hall. Sam has other worries. is the collection real, or is it an elaborate eighteenth-century dirty joke? As the new curator digs deeper, BS Moreton's world begins to unravel, and the secret behind the Dywenydd Collection turns out to be more surprising than anyone could have guessed.