Dr. Edward George Armstrong is a fictional character from Agatha Christie's novel "And Then There Were None" (formerly titled "Ten Little Indians"). He is one of the ten guests who are invited to Indian Island and become the victims of a series of murders. Dr. Armstrong is introduced as a successful and respected Harley Street surgeon, but he carries a dark secret related to a previous medical operation in which he was accused of causing a patient's death while under the influence of alcohol.
As the story unfolds, Dr. Armstrong's past and his involvement in the deaths of his patients become a point of suspicion and intrigue among the characters. Like the other guests, he becomes a target of the mysterious killer on the island, and his fate is revealed as the plot of the novel progresses.