Sam Gribley has been told that it is illegal to harbor an endangered bird, so when his beloved falcon, Frightful, comes home, he has to let her go. But Frightful doesn't know how to live alone in the wild. She can't feed herself, mate, brood chicks, or migrate. Frightful struggles to survive and learns to enjoy her new freedom. But she feels a bond with Sam that can never be broken, and more than anything else, she wants to return to him.

The sequel to My Side of the Mountain and On the Far Side of the Mountain from Newbery Medal-winning author Jean Craighead George.

"Fans of My Side of the Mountain will be glad to revisit Sam Gribley in this sequel." --The Horn Book

"Frightful's Mountain is a novel that will change the way you look at the world." --The New York Times Book Review

"Frightful's story is filled with excitement and adventure." --School Library Journal