Twelve year old boys Tony and Joe are good friends who grew up together. Tony took Joe to starve rock climbing. Joe was afraid but didnt dare to refuse, so he had to set out reluctantly. On the way, Tony suddenly changed his mind and wanted to go swimming in the river. Joe is willing to go with him because he doesnt have to climb. However, after Tony drowned in the water, how would Joe face such a fact? Panic, remorse, pain, but no courage to tell the truth... This book is intensely intertwined with Joes heart in the plot layers; Through a tragedy caused by the youths blood and arrogance, Zhongtu makes readers deeply think about how to avoid the arrogance and blind behavior in growth, and realize the value of life.