Billionaire

When 12-year-old billionaire Zig Zephyr discovers these words in his dead grandfather’s journal, he has no idea what they mean. But he quickly learns that Alton Zephyr—famous inventor, jewel thief, escaped prisoner—had many secrets…beginning with the lab hidden under his family’s garden.

And his plans for a time machine.

With the help of an eccentric scientist and his two children, Zig and his friends soon embark on a chase through history, solving a series of riddles Alton left hidden in time. Along the way, they experience some of the most important moments in American history—and learn that old family mysteries sometimes come back to life and danger is just seconds away.