The Secret Adversary is a work of detective fiction by Agatha Christie. Upon publication of the first book edition it was reviewed by The Times Literary Supplement in its edition of January 26, 1922 which described it as 'a whirl of thrilling adventures'. It stated that the characters of Tommy and Tuppence as 'refreshingly original' and praised the fact that the 'identity of the arch-criminal, the elusive 'Mr Brown', is cleverly concealed to the very end'. The New York Times Book Review was also