In one of this author's works, a handkerchief which seemingly has an H on it actually has an N, and a scarlet kimono suddenly appears in the protagonist's luggage.
In one of this author's works, a handkerchief which seemingly has an H on it actually has an N, and a scarlet kimono suddenly appears in the protagonist's luggage. That novel's character of Cassetti was formerly known as Ratchett, when he kidnapped Daisy Armstrong. In another of this author's novels, nine murderers and Justice Wargrave are lured to  (*) Soldier Island, where they are killed one by one, while another of her works sees a man stabbed twelve times on a train, a mystery solved by Hercule Poirot. For ten points, identify this author of detective fiction like Murder on the Orient Express and And Then There Were None.
In one of this author's works, a handkerchief which seemingly has an H on it actually has an N, and a scarlet kimono suddenly appears in the protagonist's luggage.
Agatha {Christie}