The main character is Evelyn, whose over-active imagination is directed into the comics she draws - the adventures of Zirconium Man and his sidekick (and Evelyn's alter-ego), Scooter. It's also her imagination that conjures up German spies on every street corner, and a trail that eventually leads to a possible spy-ring right in the heart of New York itself.
The story is written by two new-comers to the art of comics, but you wouldn't know it as it's a clearly told tale, and not overburdened with narration as some comics by pure wordsmiths are prone to. There are a couple of rather unlikely moments (the secret code that relies on a published work of fiction and the floor plan to a piece of 14th century architecture is a great idea but would seem impossible to match in reality), but they are far outweighed by the many moments of fun and excitement that move the story along at a perfect pace.
The relationship between the bohemian aunt and the flat-footed policeman reminded me of the romantic comedies of the period, perhaps played by the likes of Cary Grant and Paulette Goddard or Katharine Hepburn.
The cartooning, by a graduate of the New York School of Visual Arts, is lively and clear in both line and storytelling, and has hints of the European school of Hergé, Floc'h and Yves Chaland, with the two children often reminding me of Hergé's Jo and Zette in character, though the setting and atmosphere is very definitely American (indeed Evelyn's own comic is rendered in a fitting 1940s pulp comic style). All in all, it's another great book from First Second.