I read a couple of the Spider novels. Not bad, except having cut my teeth on more complex thriller plots I kept finding myself being disappointed by the villains' lack of ulterior motives.

Sort of like how I felt about Machiavelli's The Mandrake -- it was written at the dawn of door-slamming bedroom farce, so the whole elaborate scheme to get the woman in bed goes off as originally planned by the protagonist. It's so weird.