In 1843, novelist Victor Hugo's beloved nineteen-year-old daughter drowned. Ten years later, still unable to let go of his grief, Hugo began participating in hundreds of séances to reestablish contact with her. In the process, he claimed to have communed with the likes of Plato, Galileo, Shakespeare, Dante, Jesus--and even the Devil himself. Hugo's transcriptions of these conversations have all been published. Or so it is believed. One set of conversations was hidden by Hugo himself and has remained hidden for more than 160 years. Recovering from her own losses, mythologist Jac L'Etoile arrives on the Isle of Jersey--where Hugo conducted the séances--hoping to uncover a secret about the island's Celtic myths. But the man who invited her there, a troubled soul named Theo Gaspard, hopes she'll help him discover something quite different--Hugo's lost long conversations with someone called the Shadow of the Sepulcher.