Dark Shadows Pb Lib Novel Volume 25 Barnabas Magic Potion

Barnabas predicts trouble for Collinwood when Nicholas Freeze discovers a centuries-old potion that promises eternal youth. Soon after, Mr. Freeze's daughter Hazel, tricked into taking the serum, dies. Carolyn is grief-stricken over her friend's death. Barnabas insists she stay on at the shop to watch Nicholas Freeze and his associates, one of whom Carolyn suspects is Quentin Collins, back at Collinwood in a disguise. Then Carolyn sees Hazel's ghost! Has Barnabas made a fatal mistake by deliberately endangering Carolyn's life?