Alex Honnold has achieved almost all possible exploits in the world of climbing. However, that is not enough for him. The young mountaineer decides to carry out another challenge: to crown the summit of El Capitan, a mountain with a height of 2,307 meters without any protection to help you in the process. Alex is aware that two things can happen: Either, thanks to its physical form, able to overcome the challenge, or will embark to certain death. The documentary follows the training and climbing Alex, and the reactions of his girlfriend or his friend, director of the documentary, to what Honnold is willing to do.