Mary Roberts Rinehart 
Street of Seven Stars [PDF ebook] 

Often referred to as the "American Agatha Christie, " Mary Roberts Rinehart did much to popularize and refine the mystery genre in the United States. The Street of Seven Stars follows an American musician, Harmony Wells, to Austria, where she has gone to hone her violin skills. Though the dashing doctor she meets there appears to want to protect her, there may be more to his motives than meets the eye.