Set in bucolic 1935 Connecticut, director Robert Mulligan's chiller follows identical Perry twins Niles (Chris Udvarnoky) and Holland (Martin Udvarnoky) as a string of tragedies befalls their family. But Niles soon begins to see a link between Holland and the "accidents." With the Perry clan still reeling from the untimely demise of the boys' father, their mother (Diana Muldaur) ends up paralyzed, and a corpulent cousin is impaled on a pitchfork.