Stranded in a remote country village in 1920s England when his car breaks down, shy young Arthur finds himself drawn to the rough mechanic who comes to his aid, Bob Goodman. Forced to stay until the May Day holiday is over, Arthur makes the best of it, enjoying the village procession and fete. But the villagers seem to know more about him than they should, and there's a second, darker, May celebration that starts when the sun's gone down. In the drunken revelry that follows, Arthur is whisked off in a wild dance by Goodman, who plays the part of Jack in the Green, the spirit of the greenwood. Dancing turns to loving, but is everything what it seems? And is one night all Arthur can have?