at the ends of 17-, 24-, 38- and 48-Across is), LOOSE CANNON (17A. Unpredictable sort), CASUAL FRIDAY (24A. End-of-the-week office dress policy, maybe), BURN ONE’S BRIDGES (38A. Permanently sever ties) and CAPUCHIN MONK (48A. Franciscan order) are the interrelated group of this antediluvian Monday crossword. Are any of these detective serial