Fade to Black

Nearly all the principals in the book have something to hide, and therefore something for Archie and Wolfe to inquire about, but not every secret is criminal, and the balance between private lives (including a passionate but commercially meaningless liaison between two hostile principals) and responsible disclosure is handled adroitly, and far better than in most Rex Stout novels. Just as in Before Midnight the agency partners have strong personality clashes, but this is seen in this book as a price that is paid for complementary talents in a boutique firm.