After exhaustive training, a police dog joins an arson investigation.

A German shepherd dog found wandering loose in a city, is provided as a potential candidate to the local police K-9 Corps, where reporter Terry Dayton eagerly watches the dog's instruction. Although initially considered too wild to adapt and named "Wolf," the hundred-pound, handsome dog is put through grueling education paces paired with officer Norm Edwards. Wolf succeeds in his training and the duo is sent to investigate the mysterious death of fellow officer Bert Dana in a warehouse fire. Unknown to the police, Dana was associated with corrupt lawyer Todd Wellman, who is involved with an arson gang perpetrating insurance fraud. When Edwards discovers too much about the gang and is held by Wellman and his cohorts, Wolf comes to his rescue and the ring is broken.