On June 7, 1939, she met British author Malcolm Lowry on the corner of Hollywood Boulevard and Western Avenue at the time he had begun the second draft of Under the Volcano.
Not only did she provide the supportive environment her husband needed in order to write, she meticulously edited the novel's manuscript while various passages were rewritten at her suggestion.
"[2] After Lowry's death in 1957, Margerie Bonner returned to Los Angeles and co-edited with Douglas Day the unfinished novel Dark as the Grave Wherein My Friend Is Laid in 1968, and edited his Psalms and Songs in 1975.
[2] In 1955 Lowry was persuaded by her to return to Ripe, a small village in Sussex, England, where he died two years later "after a fatal mixture of gin and sodium amytol: the coroner's verdict was 'Death by misadventure.
'"[6] "Foul play at White Cottage", an article by biographer Gordon Bowker published in the Times Literary Supplement on 20 February 2004, outlined inconsistencies in the various different accounts of Lowry's death offered by Margerie.