Lupin goes back to a place of his past, where a counterfeiting secret society operates to attempt a more successful heist after having failed at it a few years ago.
An extension of the Lupin III TV show (on which Miyazaki worked on a few episodes) and by rights to the Monkey Punch manga as well.
This is a very fun, super villain caper (Lupin has super-thief powers which border on the magical, for the most part consisting of defying gravity, but also plenty of Bond styled gadgets, sleeping gas, ninjas, etc.) This adventure features many of the tropes we've come to know Miyazaki for: damsel/princess in distress, romance, flying machines, hidden treasures, a reference to Disney's Clock Cleaners (?) etc.
Lupin's companions from TV are all there though not very developed in the feature itself (for their full backstories you'll have to refer to the TV show.)
High speed, comedic, animated hi-jinks and thrills.