Mostly by Moonlight — Dorothy Daniels

Towering Terror.

The castle was a monument of love. Captain Jabez Warren had built it, an exact replica of one in her beloved Scotland, for his beautiful young bride. But she died a year later, and his own death in mysterious circumstances followed soon after.

Now the castle was the property of Professor Perry Warren and his lovely, impulsive daughter Eve ... and within hours after moving in they began to feel that they too were doomed to inexplicable deaths.

What were the strange blue lights on the wrecked schooner? Who was the invisible presence in the locked tower room? Did the ghost of Captain Jabez still stalk the castle's empty, echoing halls?

These and many other questions plagued Eve Warren. There was also the problem of the two men who sought her hand, both of whom seemed to harbor their own secrets. And the menace grew with each minute that ticked by...