A familiar plot and a lovable, sexual, somewhat ditsy female are at the core of this frothy comedy-crime drama found in various incarnations in movies of this type. This is a lesser sequel to the more successful Nathalie. The Nathalie of the title is a lithesome, big-hearted model played by Martine Carol (wife of French director Christian-Jacque, who ceded her position to Brigitte Bardot as France's top sex-symbol). Nathalie inadvertently gets involved with a group of spies out to steal the secret of an atomic engine. The usual inept Inspector (Felix Marten) is on the case, but in the end Nathalie manages to outwit the Inspector in thwarting the spies, not that difficult a task, apparently.
Source : allmovie.com