The Cold Aisle

He promised the truth at eight. He was dead before dawn.

Julian Maddox built Linnet, an artificial-intelligence companion that forty million people talk to. On a night when snow off Lake Ontario has shut every road, he is found dead in a hall of his own data centre, a building full of his company's computers. At eight that morning he was due to tell the public something he had kept from it.

The building runs itself and keeps a record of everything it does. The last version of his speech is in a satellite overhead, and only one key opens it.

Ines Calloway, a reporter, came to watch the data centre switched on. She stays to find out who killed him, and what he was about to say.

A murder mystery with maps, exhibits and photographs. Every clue is on the page before the answer is.