Old Man's Cave is the sixth book in the Bone series. It collects issues 33-37 of Jeff Smith's self-published Bone comic book series. It marks the conclusion of the second part of the saga, entitled Solstice. The book was published by Cartoon Books in its original black-and-white form in 1999, and in color by Scholastic Press in 2007. This book reveals more of the plotting between The Hooded One and the Lord of the Locusts, and follows the inhabitants of the valley as they pick up the pieces after the attacks by the Rat Creature army.