Knocktopia: Secret of the Mother Lode

A trail of cryptic codes sends Ben and Sam deep underground to discover a treasure more valuable than gold.

Ben Coolahan loves his life in Boston in 1873, but when his father passes suddenly, he's sent out west to the family's mine. Ben's father left him only a medallion, coded messages, and a warning to keep them secret. His new guardian, Delilah, an overbearing woman, sends him to work in the mine. Ben finds refuge with Jack, a Cornish miner who shares his superstitions and tales of the k...