In this dark comedy series, a Jewish brother and sister sneak back into time with their uncle's time machine and accidentally kill Hitler. They are delighted until they get back to the present and see the awful and odd things that have happened as a result, and each time they go back and try and fix things, reality get progressively worse, until they find they have no choice, they must save Hitler. This first book in the series chronicles their trip back in time when they kill Hitler and the awful result when they return to present day New York. You also get to meet a group of scientists who are working on an array of humanity killing projects, from zombies to contacting aliens, and the creation of a cat-dog.