After a hearty breakfast of pancakes, Nate the Great gets an urgent call from Annie.
"I lost a picture," says Annie. "Can you help me find it?"
"Of course," says Nate. "I have found lost balloons, books, slippers, chickens. Even a lost goldfish. Now I, Nate the Great, will find a lost picture."
And so Nate, with the cool detachment of a Sam Spade, plunges into his new and baffling case.
Getting all the facts, asking the right questions, narrowing the list of suspects, Nate, the boy detective who "likes to work alone," solves the mystery and tracks down the culprit. In the process, he also discovers the whereabouts of Super Hex, the missing cat!