In this dramatic conclusion to the case, brace yourself for a wedding, a funeral and a shocking twist in the tale as Hal unearths a secret about Hilary that no-one could have guessed.

When an American student vanishes into thin air, no one seems to notice, or even care. Is she on the run? Has she been kidnapped? Or is something more sinister, even paranormal, at play? Ignored by the police, shrugged off by neighbours, it falls to one man, a friend she knew online, to track her down.