The village-like neighbourhood of Passy, home to many wealthy Parisians, is the last place one would expect a murder. But when Aimee Leduc's godfather, Mobier, a police commissioner, asks her to check on his girlfriend at her home there, that's exactly what Aimee finds. Xavierre, an 'haut bourgeois' matron of Basque origin. Is strangled in her garden while Aimee waits inside. Circumstantial evidence makes Morbier the prime suspect and to vindicate him, Aimee must identify the real killer...