The Case of the Desperate Duck — Cynthia Rylant

Deep in the heart of a big city...

All of Mabel's sugar cubes have disappeared. And when you run Mabel's fancy Tea Room, missing sugar is a disaster! Who would pocket sugar cubes? And why? Someone with a sweet tooth? Or is there another reason?

This sounds like a case for the High-Rise Private Eyes -- Case #008, to be exact, the case of the desperate duck.

Because no mystery is too mysterious, no puzzle too puzzling, no crime too criminal, no trouble too troubling for ace detectives and very best friends Bunny Brown and Jack Jones.