Aka Robertson Halket. E.R. Punshon (Ernest Robertson Punshon) (1872-1956) was an English novelist and literary critic of the early 20th century. He also wrote under the pseudonym Robertson Halket. Primarily writing on crime and deduction, he enjoyed some literary success in the 1930s and 1940s. Today, he is remembered, in the main, as the creator of Police Constable Bobby Owen, the protagonist of many of Punshon's novels. He reviewed many of Agatha Christie's novels for The Guardian on their first publication.