Like his father, popular British author Edgar Wallace, he became a writer of
thrillers, some of which were filmed.
Among his final projects was a writing collaboration with Italian
director Dario Argento. This led to Argento's first three giallo
thrillers.
Brother of Eleanor Clare Hellier Wallace, Patricia Marion Caldecott Wallace and Michael Blair Wallace, half-brother of Penelope Wallace, uncle of Penelope Wyrd, nephew of Marriott Edgar, cousin of Hindle Edgar.