It's the October mid-term holiday, and cousins James and Jessica, known as the Two Jays, get an excited phone call from their friend Maddie. The builder has found the original plans for her house, and Maddie discovers it was built in 1857 on land once belonging to Rootsdyer Farm. Some later words added to the plans set the three on a hunt for an underground room somewhere in the garden. What is hidden behind the brick wall that sounds hollow? Who...