In a glamorous area of Los Angeles, the Beverley Fauborg hotel is about to close for good. Psychologist Alex Delaware and his girlfriend Robin are making a farewell visit to the hotel bar when one patron in particular grabs their attention - a beautiful but aloof young woman dressed all in white. Two days later, Alex is called in on a murder case and is shocked when he recognises the victim as the woman in white. Discovering her true identity is not going to be easy though and, Milo's investigation into the girl nicknamed 'Mystery' leads him to the darkest of secrets in the highest of places.