Here I describe the 1944-1958 Collection Petit Format (CPF) imprint from Montreal publisher Les Editions Moderne Ltee. There were 443 books in the imprint with romance (258), crime/thriller (84), popular (72) and 29 other.
There are two authors who had books in each imprint - Peter Cheyney (1 book) and Merlda Mace (also 1), a pseudonym for Madeleine McCoy. Mace's second book Headlong for Murder was first published by New York's Julian Messner in 1943. The CPF title is Ici, danger. Below is Harlequin's edition of her third book Blondes Don't Cry. Both have as a character Christine Andersen.
Harlequin 25 - December 1949
Harlequin 25 back
Collection Petit Format 108 - October 1944
Collection Petit Format 108 back