- 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.
- Son of writer Edgar Wallace (1875-1932).
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