Llywellyn is the fourth book in the Oskar quartet. It takes place in the same time and place as the previous three, but new characters appear and all characters are filled in as their interactions and complexities increase. Zeke Bevan (Llywellyn), an Interior Department geochemist, is recruited by the CIA to finger Ariadne (aka Stephanie) as a terrorist, a recruitment that led to his cameo appearance in Catan Lil. Zeke and his girlfriend, Susan, try...