'The view swung easily and smoothly, showing that the front door hadn't been forced, showing the scuffing of the carpet, the first flecks of blood at the top of the stairs. It shifted to a child's bedroom, lingering for a moment on stuffed toys before moving on. Then, an unseen hand must have pushed open the master-bedroom door. Her blood had soaked the bed brown-black. Not a pool, but a complete colour dip for the crumpled sheets and bedding on which the woman had been left, face-down...The police had twenty-four hours in which to interview the suspect and establish a good reason, if one existed, to charge him with the murder. The interviews make fascinating reading, as the officers grow increasingly frustrated at his obstinacy and at the near-perfect quality of his alibi. Then the police realize that there is a source of potentially new and interesting evidence available to them: a computer that has been seized from the suspect's house...'