Kai Lightner: sunny guy, climbing prodigy and role model at the age of 14. But his body throws a spanner in the works that he must deal with for the rest of his life. An eating disorder turned out the least of his problems. And then there is Joe Kinder: bad boy of the climbing community, ostracised by society for commenting disparagingly on a female poster’s body on social media. The two meet in a sandstone cave in Utah. Can Kai realise his dream of climbing a 5.15a route with Joe’s help?