Someone has left a crate in the basement of Graham Doubleday's new house. Inside he finds wires and panels and circuit boards. It's an unassembled machine. With the help of his son, Graham builds it. He learns that the machine can send and receive physical objects. And every day Graham receives a new transmission, each one more bizarre than the last. Then the objects become personal, items only Graham would understand. So he decides to send a few gadgets of his own. But to discover who is on the other end, Graham Doubleday will have to send the ultimate transmission - himself.