The Circular Staircase (Unabridged‪)‬

Mary Roberts Rinehart was an American writer, most well-known for her mystery novels. She was often called the American Agatha Christie, though her first novel, The Circular Staircase, was published years before Christie's. The Circular Staircase is as complex a mystery as anyone could wish for, full of twists and turns, mysterious intruders, a murder and kidnapping, bank failure, all revolving around the sinister staircase itself.