In the predawn hours of July 10, 2014, twenty-seven-year-old Cody Roman Dial, the son of preeminent Alaskan scientist and National Geographic Explorer Roman Dial, walked alone into Corcovado National Park, an untracked rainforest along Costa Rica's remote Pacific Coast that shelters miners, poachers, and drug smugglers. He carried a light backpack and machete. Before he left, he emailed his father: "I am not sure how long it will take me, but I'm planning on doing 4 days in the jungle and a day to walk out. I'll be bounded by a trail to the west and the coast everywhere else, so it should be difficult to get lost forever." They were the last words Dial received from his son. As soon as he realized Cody Roman's return date had passed, Dial set off for Costa Rica. Trekking through the dense jungle, interviewing locals, and searching for clues--the authorities suspected murder--the desperate father was forced to confront his own role in the events. Roman had raised his son to be fearless, instilling a love for the wild; they had traveled together across the globe, through rugged Alaska to remote Borneo, Bhutan, and Central America. In many ways, he had set his child on the path to Corcovado. Was he responsible for his fon's fate Did the young man, so full of confidence and ability, meet a dark end in theis lawless wilderness that is notorious for sheltering drug smugglers, poachers, and illegal miners protective of their claims? Or was Cody Roman, in fact, safe and using his finely honed outdoors skills on an epic solo adventure from which he would return at any moment?