This book includes two of my favorite du Maurier stories -- "The Birds" and "The Blue Lenses." These are brilliant enough on their own, but Michael Foreman's gorgeous watercolor illustrations bring them vividly to life. "The Blue Lenses" especially benefits from pictures, since it's a terrifying story of how a woman's vision changes after what should have been a routine operation. Getting to see what she sees makes the story so much more gripping.
"The Alibi" also benefits quite directly from illustrations. The main character decides to take up art (and murder), and Foreman illustrates du Maurier's descriptions of this psychopath's clumsy attempts to paint.
I love du Maurier's short fiction anyway, but this illustrated collection is really worth looking out for. It doesn't seem to be in print any more, but it's the kind of book libraries tend to carry.