From the DJ:
Thirteen-year old Scott and his younger sister Melinda expected new-school problems but not the baffling, peculiar events of their first weeks on the Oregon farm their great-grandfather had left their mother. They had always heard talk of his "Money Room" but never a hint of where--or what--it was. Now, with no friends yet and their mother absorbed in her new job, they were determined to find whatever treasure the old house held.
Spurred on by a passage from an old diary and the startling contents of a tin box they found in the attic, Scott and Lindy plunged into a deepening mystery, one that soon had them wondering uneasily who else was trying to find the Money Room, and what would happen if he got there first.