Showing The Mummy, the Will, and the Crypt by John Bellairs

In this, the second book in the Johnny Dixon mystery series, Johnny must find the lost will of Mr. H. Bagwell Glomus, a man of great fortune and sinister witchcraft. Mr. Glomus’s widow is offering a $10,000 reward to anyone who finds its hiding place, enough money to help Johnny’s grandmother get the operation she needs. So, Johnny will stop at nothing to find the will.

With his neighbor, Professor Childermass, and his new friend Fergie, Johnny won’t rest until he solves the puzzle. From Boy Scout camp to hotel windows to underground passageways, Johnny races to find the right clues, all the while with the supernatural nipping at his heels…