TV The Hardy Boys / Nancy Drew Mysteries - Season 1 Episode 4 : The Mystery of the Diamond Triangle The Hardy Boys / Nancy Drew Mysteries - Season 1 Episode 4 : The Mystery of the Diamond Triangle 7.107/10 by 28 users 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. Details Casts Posters Images Title The Hardy Boys / Nancy Drew Mysteries - Season 1 Episode 4 : The Mystery of the Diamond Triangle Alternative Titles The Hardy Boys First Air Date 1977-01-30 Last Air Date 1979-01-14 Number of Episodes 46 Number of Seasons 3 Genres Mystery, Action & Adventure, Networks ABC, Casts Shaun Cassidy, Parker Stevenson Plot Keywords , Joe Hardy Shaun Cassidy Frank Hardy Parker Stevenson Episodes List The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 1 The Mystery of the Haunted House The Mystery of the Haunted House 1977-01-30 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 2 The Mystery of Pirate's Cove The Mystery of Pirate's Cove 1977-02-06 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 3 The Mystery of Witches' Hollow The Mystery of Witches' Hollow 1977-02-13 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 4 The Mystery of the Diamond Triangle The Mystery of the Diamond Triangle 1977-02-20 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 5 The Disappearing Floor The Disappearing Floor 1977-03-06 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 6 The Secret of the Whispering Walls The Secret of the Whispering Walls 1977-03-13 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 7 The Flickering Torch Mystery The Flickering Torch Mystery 1977-03-27 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 8 A Haunting We Will Go A Haunting We Will Go 1977-04-03 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 9 The Mystery of the Flying Courier The Mystery of the Flying Courier 1977-04-10 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 10 Mystery of the Fallen Angels Mystery of the Fallen Angels 1977-04-17 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 11 Wipe Out Wipe Out 1977-04-24 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 12 The Mystery of Ghostwriters' Cruise The Mystery of Ghostwriters' Cruise 1977-05-01 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 13 The Secret of the Jade Kwan Yin The Secret of the Jade Kwan Yin 1977-05-15 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun... The Hardy Boys / Nancy Drew Mysteries Season 1 :Episode 14 Mystery of the Solid Gold Kicker Mystery of the Solid Gold Kicker 1977-05-22 The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun...