In 1933 and 1934, Thomas Minehan, a young sociologist at the University of Minnesota, joined the ranks of a roving army of 250,000 boys and girls torn from their homes during the Great Depression. Disguised in old clothes, he hopped freight trains crisscrossing six midwestern states. While undercover, Minehan associated on terms of social equality with several thousand transients, collecting five hundred life histories of the young migrants. The result was a vivid and intimate portrayal of a harrowing existence, one in which young people suffered some of the deadliest blows of the economic disaster.