Constantly hearing Hobbes' voice in his head, he concludes that his only hope is for Bill Watterson to draw one last strip of Calvin as a healthy 17-year-old, and thus — accompanied by Susie — he sets out to walk across the ice of Lake Erie in an attempt to reach Watterson's Cleveland home.
[1] Publishers Weekly called it "(f)unny, intellectual, and entertaining" and "a sensitive yet irreverent adventure about a serious subject", and noted the possibility that Susie's participation in Calvin's quest may be another hallucination.
[3] At Quill and Quire, Eisha Marjara described the novel as "highly polished", with "virtually flawless" writing and "a plot that could have been hokey but is anything but", and compared Leavitt's dialogue to that of David Mamet.
[4] The Bulletin of the Center for Children's Books found it to have a "barely credible premise", and to be "schizophrenia-lite" and "more a treatise on philosophy than psychology", but nonetheless praised its "well-paced dialogue", and emphasized its "clever sheen" on "the extreme questions of teenage angst", including "how do we know the difference between what we imagine and what is real", "how should friendships and romantic relationships work", and "how should we grieve the loss of childhood".
Subsequently, while rereading a Calvin and Hobbes compilation, she realized that "nowadays, Calvin would probably be diagnosed as schizophrenic", and conceived the notion of "Calvin, having schizophrenia, feel[ing] that he's been given this illness by Bill Watterson, his creator" and asking Watterson to cure him; since a pilgrimage to find Bill Watterson did not in itself seem particularly interesting, Leavitt integrated elements from the story of Dave Voelker, who walked across the ice of Lake Erie in winter.