The accent is more on comedy than mystery in Alias Boston Blackie, as Chester Morris spends more time making fools of the local law enforcement than in actually solving the case. For the 67 minute running time of Alias Boston Blackie, Morris only spends about 10 minutes or so toward the end in actually apprehending the criminal.
Morris and his valet George Stone are taking a trip to prison with a revue show as a Christmas treat for the inmates, many of which Morris did some time with. In the revue is show girl Adele Mara who has a brother, Larry Parks, among the inmates.
What she doesn't know is that Parks is planning to use the show to crash out and settle with the two guys that framed him for a robbery. When he makes it, Blackie's watchful nemesis Inspector Richard Lane assumes as he always does that Morris had something to do with it.
So Morris has to clear himself and in doing so help Parks find his quarry. That's made even more complicated by one of the two showing up dead in a hotel room.
But before Boston Blackie can get to work he has to constantly avoid the police who seem to have graduated from the Keystone Academy. In fact Lane's partner Walter Sande is the second dumbest detective in the world, only exceeded by William Bendix in Who Done It. The way that Morris keeps constantly making a fool of Sande, you can almost feel sorry for the poor slob.
The pace is quick in Alias Boston Blackie with this definitely being one of the funnier of that mystery series.