3 Seasons

Season 1 Season 2 Season 3

Episode

The Mystery of the Haunted House (1977)

Frank and Joe end up in a haunted house and a cemetery when they follow two men trailing their father, Fenton.

Directed By: Glen A. Larson
Writer: Glen A. Larson

The Mystery of Pirate's Cove (1977)

Nancy and her friends see a beam of light coming from an abandoned lighthouse. When they call the local sheriff, he thinks they're imagining things because the light has disappeared. It's up to Nancy to Expose the strange mystery that surrounds the desolate structure. Soon, she finds herself in a deadly web of crime that could threaten her very life.

The Mystery of Witches' Hollow (1977)

When the pair pay a visit to Captain Maguire, they are greeted by a strange woman who claims that Maguire has become one of the victims of Witch's Hollow. Those who go to the mysterious wooded place never return. Undaunted, Frank and Joe begin their search for Maguire, little suspecting the terrors that lie in wait for them among the dark shadows of the eerie forest.

The Mystery of the Diamond Triangle (1977)

After Nancy and her girlfriend, George, see an automobile run off the road. Nancy tells her boyfriend, Ned Nickerson, to report it to the sheriff. Later the sheriff tells Nancy that his men could not find any signs of an accident, and that the road has been closed for a long time. Nancy attempts to unravel the bizarre occurrence on her own, and soon finds herself in the midst of danger.