The Stooges try to get jobs with Scotland Yard after graduating from a correspondence detective school. They end up as "Yard Men" picking up trash and pruning the hedges. They inadvertently get their chance to crack a case. Dressed in kilts and talking in phony Scottish accents, the Stooges (as McMoe, McLarry, and McShemp) are given the task of guarding the prized possessions of The Earl of Glenheather Castle (Herbert Evans). The castle staff are actually ransacking the castle while the boys sleep there, though they eventually arrest the crooks.