The Tic-Tac-Toe Mysteries of Xerloc O'Xolmes

Fun to read and puzzle through. The detective's name called to mind Leblanc's Sherlock Holmes theft/fanfic as an antagonist for Lupin: Herlock Sholmes [0].

[0] https://en.wikipedia.org/wiki/Ars%C3%A8ne_Lupin_versus_Herlo...