Edison's Gold — Geoff Watson

Solving a centuries-old family mystery is Tom Edison's only hope to stop his family from moving to Kansas. His famous name­sake and great-great-grandfather, Thomas Edison, had discovered the secret formula for changing metal into gold, and now Tom and his friends are on a whirlwind adventure to find the key to this monumental discovery. But can the three friends uncover Edison's secret formula in time and escape the clutches of an evil billionaire?

Full of gadgetry, historical rivalries, secret societies, and bad guys galore, Geoff Watson's Edison's Gold is a thrilling adventure for middle-grade readers.