Jimmy "Mr. Cupid" O’Brien and Thomas H. Jefferson are making deliveries for the local florist and manage to get a job for their unemployed friend, Susie Carey.
They are unaware that the proprietor, Mr. Morgan, is part of a spy and saboteur ring which is using the florist shop as a front for delivering coded messages and bombs.
Using lesson two of his correspondence course on graphology, Jimmy learns the truth but it might be too late for intrepid investigative reporter Callahan and the police to help them before the bomb they are supposed to deliver goes off at an airplane factory.
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