You know you're innocent, so what do you do when given the chance? you escape from custody, grab a girl, fall in love, that is it, the entire plot.
The two lead characters are wooden, uninteresting, but the character actors, oh what a turn around, they breathe life into an initially mundane movie.
C. Aubrey Smith, Dooley Wilson and Barry Fitzgerald are alive and animated, they carry the movie over some rocky terrain, allowing it to arrive at its very predictable conclusion.
Ignore the faults, because the positives far outweigh them.
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