The Yellow Villa – Suzanne Blanc (Macfadden, 1968)

Giallo-tastic!

It seems author Suzanne Blanc - sometimes mistakenly assumed to have been French (see comments) - wrote several crime novels set in Mexico, winning two Edgar Allan Poe awards and a French 'Grand Prix de Littérature Policière' in the process. Beyond that though, biographical info is not forthcoming.