In the short story The Red Signal, Milson is the manservant of Dermot West. He had his day off during the time of the events in the story and so did not appear in person. When the police came knocking at the door with a warrant for the arrest of Dermot, he sensed danger and had the presence of mind to pretend to be Milson. Inspector Verall went off but left a policeman Cawley to wait for Dermot to come home. Dermot asked permission to go to the kitchen to make some tea and from there escape by means of a tradesman's wire lift.
Portrayals[]
In the episode The Red Signal of The Agatha Christie Hour, a TV film adaptation of the story, the part of Milson is played by Hugh Sullivan. He appears in the first scene helping Dermot West dress for dinner and being given the night off. Milson is only mentioned in the original story and does not appear in person.