Entertaining "caper" with an excellent cast, good direction, but a lackadaisical and very campy plot. Loosely in the Hitchcock mode. Grant takes on 4 names as a playboy "thief"/secret agent/etc. It's just a bit too whimsical, the villains too "bad." Still, it's a fun little romp -- I especially remember the scene where Grant has to fight George Kennedy with a hook-arm on the rooftop. The romantic moments seem contrived, though, and Hepburn is very young for Grant -- as usual, the film takes no notice of this. Nice location photography, solid but not exceptional direction by Donen.