The Two Travelers — Mark Jeffrey

The second book in the Max Quick Series! Five quiet years have passed in Starland, California since the the time of the Pocket. But when a crazed old man shows up with a warning, Max, Casey, Ian and Sasha suddenly find themselves on the run. Max and Ian go through an Arch back to 1912, where a mysterious Machine is under construction that seems connected to Max's unremembered secret. Meanwhile, Casey and Sasha follow the old man to the strange town of Arturo Gyp.

But there is more afoot than meets the eye: the enemies of Mr. E - the nefarious Archons - are abroad. And when Max is at last eye-to-eye with his secret, he realizes nothing will ever be the same again ...