Arnie and the Hitchhiker (cross platform version) | Undertow Take on the role of Arnie, who gets dumped by his girlfriend, and makes a wrong turn on his way home. Arnie subsequently encounters a mysterious female hitchhiker [Marcella] with a dark secret. This could be a night he'll never forget. Can you solve the mystery and save Marcella from her horrible fate, or will Arnie meet his doom? There are six endings. The ending you get depends on choices you make in the game.