This author's novels N or M?, By the Pricking of My Thumbs, and The Secret Adversary star themarried couple Tommy and Tuppence Beresford. This author was inspired by the Lindberghkidnapping to write a novel about the murder of "little Daisy Armstrong". The controversial endingof one of this writer's novels features Dr. James Sheppard preparing to kill himself after beingimplicated as a blackmailer. In one of her books, a (*) Belgian uses his "little gray cells" to concludethat every passenger on a train coach murdered Mr. Ratchett. For 10 points, name this female author whosecharacter Hercule 
This author's novels N or M?, By the Pricking of My Thumbs, and The Secret Adversary star themarried couple Tommy and Tuppence Beresford. This author was inspired by the Lindberghkidnapping to write a novel about the murder of "little Daisy Armstrong". The controversial endingof one of this writer's novels features Dr. James Sheppard preparing to kill himself after beingimplicated as a blackmailer. In one of her books, a (*) Belgian uses his "little gray cells" to concludethat every passenger on a train coach murdered Mr. Ratchett. For 10 points, name this female author whosecharacter Hercule Poirot investigated crimes in The Murder of Roger Ackroyd and Murder on the OrientExpress.
This author's novels N or M?, By the Pricking of My Thumbs, and The Secret Adversary star themarried couple Tommy and Tuppence Beresford.
Agatha Mary Clarissa Christie [or Agatha Miller; or Mary Westmacott]