Where were they?
In fact, when were they?
And how could they get back?

It's easy to stow away on an intergalactic spaceship, if you're a smart lad like Max Jones. But it's quite another thing when the spaceship touches down on an unknown planet after passage through a time warp... perhaps in an unknown century. Especially when the spaceship's pilot dies, and his charts and tables are destroyed. Now survival was up to Max...