Final answer:
In 'The Truth as Told by Mason Buttle', Mason finds Calvin in a root cellar, highlighting the novel's themes of friendship and loyalty.
Step-by-step explanation:
In the book The Truth as Told by Mason Buttle, Mason finds his friend Calvin hidden in a root cellar underneath the Buttle family's fallen-down shed. It is revealed that Calvin has been there for some time, orchestrating his disappearance as part of an elaborate game. While the exact details of the discovery are crucial to the mystery and character development within the novel, what stands out is the deep bond and the theme of friendship that Mason and Calvin share.