What is the author's tone in the memoir, Marching Powder: A True Story of Friendship, Cocaine, and South America’s Strangest Jail?

This book has an eclectic tonal mix. During Rusty's description in Part One of his experiences at the prison, the tone is wide-eyed and excited, as one might expect of a young backpacker on an adventure. At the start of Part Two, Thomas adopts a self-assured, calm, and experienced tone in describing his work as a drug smuggler, which gives the impression that the book will be a suave crime thriller. After Thomas is arrested and thrown in a terrible temporary jail, the tone quickly turns abject. When Thomas arrives at San Pedro, he becomes befuddled and meek under the wing of Ricardo, who saves him from almost certain death. Once Thomas gets money from the outside and buys his own cell, his self-assurance begins to return, and he adopts a tone similar to the confident one at the start of Part Two, but tinged with the humility of recognizing that he is a prisoner, and no longer a freewheeling "mastermind" criminal.