Anyone who enjoyed Stephen Ambrose's Undaunted Courage or any other tale of exploration and hardship will love River of Doubt. Candice Millard's new book chronicles the expedition of Theodore Roosevelt and his Brazilian co-commander, Candido Mariano da Silva Rondon, down one of Amazon's last unexplored tributaries in 1914-the River of Doubt. The 400-mile river trip tested every ounce of the ex-president's intellect, courage, and physical stamina. Millard's book, therefore, is more a tale of survival than adventure.

Roosevelt and his American companions were woefully unprepared for their journey. They brought boats too large to be of use on a shallow river, and had to rely instead on Indian-made dugouts-canoes designed more for local transportation on flat water than long-distanced descents through rapids. The American and Brazilain members of the group often had to portage these heavy, waterlogged boats around rapids, which cost the group both time and precious food supplies.

Food proved to be one of the most vexing problems of the journey. Much of the canned food shipped from the United States was too heavy to be carried to the expedition's launching point in the Brazilian highlands, and had to be discarded. Instead, Roosevelt hoped to augment his increasingly meager rations with game shot along the way. Unfortunately, the rain forest did not offer much bounty and the group ended up eating monkeys and piranhas to survive-creatures far more difficult to kill than deer and antelope.

If that were not enough, disease plagued the expedition at every corner. Kermit, the son of President Roosevelt, fought malaria for most of the trip and Theodore almost died when he contracted a deadly bacterial infection from a small flesh wound. Author Candice Millard does an excellent job of describing the numerous hazards confronted president shared in the work, dangers, and hardships of the journey. In one scene, she shows Roosevelt washing the clothes of his companions and in another, the sick ex-president giving away his rations to one of the expedition's "more productive" Brazilian laborers. In short, readers will walk away from this book with new-found appreciation for President Roosevelt and his undaunted courage-something often lacking in today's breed of politicians.

There is a spate of books concerning Theodore Roosevelt's life: his New York years and first marriage, his cowboy days in the Dakota's, the Spanish-American War phrase and his presidency. Until last year, there were few books about his retirement decade until Patricia O'Toole's "When Trumpets Call." His dangerous exploration of the Amazon rain forest covers a mere 7 pages in Ms. O'Toole's biography. That exploration is the subject of "The River of Doubt."

Does this brief three month trip of discovery on the Rio da Duvida (River of Doubt) warrent a full scale book? In Ms. Millard's superb account of the near fatal expedition, the answer is yes. The former president was an adrenaline junkie who needed to forget his loss in the 1912 campaign for the White House. He found all the adventure he would ever crave on the Rio da Duvida, for he was way in over his head. If not for their guide, Colonel Candido Rondon, no one would have made it out alive -- Roosevelt's disappearance would have top Amelia Earhart as the mystery of the century. This adventure yarn focuses, not on the political animal, but on a man who would never quit and never did.

When I saw River of Doubt it struck me as a fascinating story and I immediately put in my order with Amazon. As I waited for it to arrive, I began to worry that I might have been too impulsive. Afterall, a fascinating story can be as limp as milk toast in the hands of a mediocre writer. I wondered if the author would bring Roosevelt's Amazon journey to life without adding so many extraneous details about Roosevelt himself that the real adventure was lost. Or, on the other hand, not supplying enough details about the central characters to allow me to understood the true context in which the adventure occurred.

After I got the book and started to read, all of my concerns were put aside. Completely. I know next to nothing about T. Roosevelt. Millard gave me what I needed to know to understand why he would take such a dangerous trip, at such a late age, in the first place.

She was equally masterful with all the other participants (many fascinating characters in their own right). I think Millard was near perfect in giving the background of people and why they ended up on this diasterous adventure while keeping the story moving at a fascinating and absorbing clip. One really gets a sense of how people were feeling when they started with what they thought would be a casual adventure and found themselves descending into one of Earth's strangest hells. It's a spellbinding story delivered by a very competent writer and researcher.

I've always enjoyed true stories of the Amazon River. Miller's River of Doubt is fascinating, informing, and gripping and stands with the best of them.