Thin Air is the next book in Ann Cleeves' Shetland series - which is now a major BBC One drama starring Douglas Henshall as detective Jimmy Perez. A group of old university friends are in Unst, Shetland's most northerly island, to celebrate the wedding of one of their friends to a Shetlander. But late on the night of the wedding party one of them, Eleanor, disappears -- apparently into thin air. It's mid-summer, a time of light nights and unexpected mists. The next day Eleanor's best friend Polly receives an email from her saying she'll never be found alive. And so it seems, because the woman's body is found, lying in a small loch close to the cliff edge. Before she disappeared Eleanor claimed to have seen the ghost of Peerie Lizzie, a child who was drowned close by in the 1920s. And as the investigation progresses Polly feels that she too is being haunted. The case takes Jimmy Perez out of his comfort zone to London, to talk to Eleanor's colleagues and friends. But the final solution to the mystery takes him back to Shetland once more. Also available in the Shetland series are Raven Black, White Nights, Red Bones, Blue Lightning and Dead Water. Ann Cleeves' Vera Stanhope series series (ITV television drama VERA) contains six titles, of which Harbour Street is the most recent.