Pat O'Brien shows up on the docks, down and out and in need of a job. His brother Chester Morris, construction manager, reluctantly hires him on. Very soon we discover that O'Brien's real job here is not building ships.
This WWII spy thriller has a bit of romance thrown in and features an assortment of characters whose personal and wartime lives often overlap:
Carole Landis and Ruth Warrick are both quite good as women doing jobs that take precedence--at least during wartime--over their personal lives or relationships. Landis is a fellow agent who poses as O'Brien's wife; Warrick is Morris's assistant in the shipyard office. Morris would like to marry Warrick but she may still have feelings for her old flame, O'Brien--whose professional regard for Landis may grow into something more.
Wallace Ford, always fun to watch, is part of "the team"--his main job being spotting Nazis at the shipyard. Barton MacLane is excellent as a rough-edged yard worker whose eventual friendship with O'Brien is hard fought.
The plot is solid: O'Brien and Ford keep an eye out for saboteurs while Morris and Warrick, realizing that O'Brien is no ordinary dock worker, keep an eye on him. There's some comic relief that isn't too funny, unfortunately, and also some cute scenes involving a couple of war orphans that just aren't real convincing.
It's a great role for O'Brien, though, as that rugged American everyman who doesn't say much but performs awesome feats.