Sydney's Observatory on a balmy summer evening is the perfect venue for a cocktail party and, it would seem, a murder, for Peter Van Goren's body is discovered bludgeoned to death in the grounds. The first question Detective Chief Inspector Fitzjohn must answer is why Van Goren was present given his name does not appear on the guest list. The second is, what was the subject of Van Goren's vehement argument with Richard Carmichael, one of the function's hosts.

Meanwhile, Richard's son, Ben Carmichael, a photojournalist, returns to Sydney from an overseas assignment to find his fiancée, Emma Phillips, has gone missing. Although unavoidably dragged into the police investigation, Ben goes in search of her. In so doing, he is drawn to Lane's End, the abandoned family estate where the very atmosphere awakens disturbing memories.

Through a maze of twisted stories, Fitzjohn follows a winding path to solve his case, but he is not prepared for the spiralling perplexity his quest creates.