We've got the evil Professor Tode (who modifies an atom-smasher into a time machine that travels to the Palaeolithic and to Atlantis), a fatherly older professor, his beautiful young daughter (menaced by evil Tode), casually written racist pronouncements (by Rousseau), and our hero scientist, the dashing Jim Dent. But my favorite sentence was the brief description of quantum mechanics, which I didn’t expect in a 1930 science fiction tale.

Andrew Harlan, Technician in the everwhen of Eternity, falls in love and starts a chain of events that could lead to the end of everything.

After an accident at a temporal research facility in Idaho, a manlike monster known as John Delgano shows up for half a seoncd once a year at the same time and place.

As early as the 1930s, stories have addressed the issue of the Earth moving to a different position when a time traveler moves through time. This story addresses the issue by saying that the time traveler appears only once per year, but that doesn't really solve the problem for so many reasons, starting with the fact that a given position on the surface of the Earth will not be at “the same” position in the subsequent year.

This first book of the multi-author series tells of how teens Dak (a history buff and odd duck), Sera (a science nerd), and Riq (a member of the secret Hystorians society) end up as the only ones who can save the world by fixing breaks in time that changed what was meant to be. Their first mission—saving Columbus from a mutiny that was meant to fail—is a disquieting choice that I would not choose as an introduction of history to children. For starters, they are choosing to save the man who brought genocide to the Americas. And to boot, in the broken world where the mutiny succeeded, his three ships still completed their voyage with no noticable change to subsequent centuries (apart from Columbus resting at the bottom of the Atlantic).