Amazon.com Product Description (ISBN 0425189457, Paperback)

Turing Hopper is an Artificial Intelligence Personality, a mainframe computer with a mind like Miss Marple. And when her creator, Zack, begins missing work, the sentient Turing senses foul play...

Amazon.com Book Description (ISBN 042518191X, Hardcover)

When a workaholic techie misses work for several days, his friend, Turing, does the only neighborly thing and checks in on Zack. She checks to see if he's logged in from home. No luck. Then she skims the databases of local banks. Nothing. Next she searches hospital records throughout the state. No Zack.

Turing is no crazed stalker: she is an artificial intelligence personality of Zack's creation. But, unlike other AIPs, Turing is sentient-and she senses foul play. She finds clues, but Zack's enemies may well lie in the real world-outside the planet of the AIPS-where Turing has no ability to move.