Barnabas, Quentin and the Mummy's Curse (April 1970)
When Professor Anthony Collins decides to catalog his Egyptian relics at Collinwood, he brings with him the mummy of King Rehotip, who “died” over two thousand years ago. Only the professor knows that Rehotip is really in a state of suspended animation.

One night, the professor brings the mummy to life. Suddenly a young girl is killed. The police suspect Quentin Collins. Maggie Evans, certain the killer is the mummy, wants to warn the police. Professor Collins threatens to accuse Barnabas if she does. Frightened into silence, Maggie lives in terror, wondering if she will be the next victim.

Barnabas, Quentin and the Avenging Ghost (May 1970)
When the jury of which Roger Collins is chairman finds Harriet Barnes guilty of murder, she swears vengeance on the entire Collins family, then kills herself.

Soon, Celia Dalton, a guest at Collinwood, starts suffering strange spells. Each time she does, someone at Collinwood is violently attacked. Has Harriet Barnes taken over her spirit, making the innocent girl a bloodthirsty killer? Can Barnabas and Quentin save Celia—and the Collins family—from this menace out of the crypt?

Barnabas, Quentin and the Nightmare Assassin (June 1970)
Carolyn Stoddard is knocked unconscious when the sports car she and Barnabas are riding in skids on a patch of ice. She regains consciousness in Collinwood with Barnabas and Quentin Collins at her side—but the year is 1870! And Collinwood is being terrorized by a savage killer. Carolyn likes Quentin and refuses to believe that even in werewolf form, he could be the murderer.

​But even Quentin is convinced of his own guilt. The old family lawyer hires someone to kill him. Several days later, before he can reveal the assassin’s name, the lawyer dies. Quentin has signed his own death sentence, marked for death by an unknown killer.