[1] Morton's comedy called Detective Sparkes opened at the Garrick Theatre in August 1909 to good reviews.

In 1914, Morton's play, The Yellow Ticket ran 183 performances on Broadway and starred Florence Reed and John Barrymore.

A German version called Der Gelbe Schein was produced in 1918 and starred Pola Negri.

It was also titled The Yellow Ticket; its players were Elissa Landi, Lionel Barrymore and Laurence Olivier.

He adapted Agatha Christie's novel The Murder of Roger Ackroyd into a play called Alibi, which opened in London in 1928.