Walter Tyson is a bully and a manipulator. To his own surprise, he fell in love with a woman he married for her money. And then, she died trying to give him a daughter, who also perished young. The only thing Walter has left of her is The Book of Hours, a priceless tome he grudgingly agrees to display at a museum. There is a locked case, and opening it causes impervious doors to close. And a camera permits guards to watch the book constantly from a security station. And then, the book disappears. Banacek figures part of the method immediately. But to deduce who committed this crime, he'll need to consider motives.