When Poirot investigates the mysterious death of a despised art dealer, he finds that he has more than enough suspects from which to choose.
a bit of a cheek,
Fauvisma, style of painting with vivid expressionistic and nonnaturalistic use of color that flourished in Paris from 1905 and, although short-lived, had an important influence on subsequent artists, especially the German expressionists. Matisse was regarded as the movement's leading figure.
out of my depth (in water too deep to stand in. beyond one's knowledge or ability to cope.)
stumble across, snobbery