The Bearcat, alias The Singin' Kid, crosses the Rio Grande into Three Pines, singing bloodthirsty verses, but in spite of these, he makes friends with Sheriff Bill Garfield and likewise with Alys May, daughter of cattle rancher John P. May, by saving her from a runaway. As a reward, he gets a job on the ranch and falls in love with Alys, though warned she is engaged to Aitken, her brother's college chum.

Mildred Garson, secretary and fiancée of playwright Anthony Moore, would like to play the leading role in his new play, a crook drama. Her brother Jim and sister Rita arrange to stage a fake robbery at Moore's home so that Mildred can demonstrate her ability. However, real thieves led by Dan "The Fox" Grogan appear, shoot Moore's butler, and kidnap Mildred. She manages to escape and find refuge with Chong Wo, a Chinese philosopher. In a fight to the finish, Wong arranges for Grogan to be captured, leaving Anthony and Milfred to get married.