He returned to the thriller genre in Assault on a Queen (1959) and tried his hand at comedy in Good Neighbor Sam (1963), a novel based on his experiences as an adman, played by Jack Lemmon in the film version. Finney first showed an interest in time travel in the short-story collection The Third Level, which included stories about a commuter who discovers a train that runs between New York and the year 1894, and a man who rebuilds an old car and finds himself transported back to the 1920s. The 1956 film Invasion of the Body Snatchers was remade twice. Finney maintained that the novel was nothing more than popular entertainment. Many critics interpreted the insidious infiltration by aliens as a cold-war allegory that dramatized America's fear of a takeover by Communists. A year later he published The Body Snatchers (later reissued as Invasion of the Body Snatchers), a chilling tale of aliens who emerge from pods in the guise of humans whom they have taken over. His first novel, Five Against the House (1954), told the story of five college students who plot to rob a casino in Reno. After moving to New York and working in the advertising industry, he began writing stories for popular magazines like Collier's, The Saturday Evening Post and McCall's.

Finney, whose original name was Walter Braden Finney, was born in Milwaukee and attended Knox College in Galesburg, Illinois.

The novel, about an advertising artist who travels back to the New York of the 1880s, quickly became a cult favorite, beloved especially by New Yorkers for its rich, painstakingly researched descriptions of life in the city more than a century ago.

Two of his novels, The Body Snatchers and Good Neighbor Sam became the basis of popular films, but it was Time and Again (1970) that won him a devoted following. Finney specialized in thrillers and works of science fiction.

Time and Again by Jack Finney