I first read Josephine Tey's novels years ago, and loved them. I recall wincing at time at her bigotry, but managed to squint past it. It was problematic in this book.

- SPOILERS BELOW -

It may be worse than some -- the suspect is an Englishman with an Italian grandmother (or some such). The detective refers to him as the "Levantine" throughout the book, and considers him likely to stab a friend in the back with a fancy dagger because of his heritage. There are other, less in-your-face racist comments or description as well.