Part 1. Black widower mysteries: The obvious factor. The pointing finger. Out of sight. Yankee Doodle went to town. Quicker than the eye. The three numbers. The one and only east. The Cross of Lorraine. The next day. What time is it? Middle name. Sixty million trillion combinations. The good samaritan. Can you prove it? The redhead
Part 2. Union Club mysteries: He wasn't there. Hide and seek. Dollars and cents. The sign. Getting the combination. The library book. Never out of sight. The magic umbrella. The speck
Part 3. Miscellaneous mysteries: The key. A problem of numbers. The little things. Halloween. The thirteenth day of Christmas. The key word. Nothing might happen.
