Gavin Cain, an SFPD homicide inspector, is at an exhumation when his phone rings. The mayor is being blackmailed and has ordered Cain back to the city, a helicopter is on its way. The casket, and Cain's cold-case investigation, must wait. At City Hall, the mayor shows Cain four photographs he's received: the first, an unforgettable blonde, the second, pills and handcuffs on a nightstand, the third, the woman drinking from a flask, and last, the woman naked, unconscious, and shackled to a bed. The accompanying letter is straightforward: worse revelations will come unless the mayor takes his own life first

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