A near-fine first edition, in the original binding. In a very good, unclipped dust jacket. There is a crease running the length of the spine, a small chip to the top of the spine, and a small tear to the bottom of the spine. There are several tapemarks on the front flap, where the jacket has been taped down.

This is the 32nd William book and features more adventures of the 11-year-old in which Jumble, William's dog, finds himself being trained by William to be a police dog. Douglas - of the Outlaws - is ordered to commit a crime so that Jumble can respond.