Title: Nurse on Nightmare Island
Author: Lois Eby
Illustrator: Lou Marchetti
This is uncredited, but it is remarkably similar to the cover of Leap in the Dark, which is credited to Lou Marchetti.
Barris was a conscientious nurse. When she surmised from his letters that Dr.
Harvey Jenkins, the world-famous physicist who had been her patient at the
hospital, was on the verge of a relapse, she went immediately to Morago Island,
the ancient pirate hideout where he was recuperating. She knew her mission of
mercy would be incredibly difficult. She couldn’t know that before the weird
affair was over, lives would be lost—and her own life would be magically changed
by an overpowering romance.