"Four Afoot" presents an exciting story of the big four- Nelson, Dan, Bob, and Tom. It tells about their experiences as they go on a simple walking tour of Long Island, but it turns out to be more adventurous than expected.

Ralph Henry Barbour (November 13, 1870 - February 19, 1944) was an American novelist, who primarily wrote popular works of sports fiction for boys. In collaboration with L. H. Bickford, he also wrote as Richard Stillman Powell, notably Phyllis in Bohemia. Other works included light romances and adventure. His works include: Captain of the Crew (1901), Weatherby's Inning (1903), The Crimson Sweater (1905), Harry's Island (1908), The Lilac Girl (1909), Kingsford Quarter (1910), Team-Mates (1911), The Harbor of Love (1912), Left End Edwards (1914), The Purple Pennant (1916), The Junior Trophy (1918) and Hero of the Camp (1932).