Mary Roberts Rinehart 
Sight Unseen 

Mary Roberts Rinehart rose to literary acclaim as a mystery writer and eventually became known as the "American Agatha Christie." In Sight Unseen, Rinehart strays somewhat from the formula that made her famous, incorporating supernatural elements into the mystery at the heart of the novel. If you’re looking for a fast-paced read that will send shivers down your spine, put Sight Unseen on your must-read list.