It's 1:15 a.m. Connie Bowskill should be asleep. Instead, she's logging on to a property website in search of a particular house: 11 Bentley Grove, Cambridge. She knows it's for sale; she saw the estate agent's board in the front garden less than six hours ago. Soon Connie is clicking on the "e;Virtual Tour"e; button, keen to see the inside of 11 Bentley Grove and put her mind at rest once and for all. She finds herself looking at a scene from a nightmare: in the living room, in the middle of the carpet, there's a woman lying face-down in a huge pool of blood. In shock, Connie wakes her husband, Kit. But when Kit sits down at the computer to take a look, he sees no dead body, only a pristine beige carpet in a perfectly ordinary room …
