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Carson goes undercover with London to solve the mysterious disappearance of a number of stagecoaches. The pair are pitted against Steward, thinking she is an outlaw when, in fact, she is also working undercover. They follow clues to a nearby lake, drain it, and find a missing coach. Finally, the finger of guilt is pointed at the owner of the stagecoach line. Carson manages to save the day, rescuing a captured London in the process and putting the sly owner behind bars.