Here's the problem with this book: I never really got any idea why Fantomas was doing all this shit. I mean, he gets up into these elaborate disguises so he can kill one person or another, but why does he want that person dead? Not really explained. And he also makes some pretty stupid mistakes for being such a genius mastermind. Shit Moriarty would never have put up with.
I'm just saying, if you're writing a book about a criminal genius, the criminal should do genius things. Not just really convoluted things.
And there's quite a deus ex machina there at the end, too. Trail of the Serpent
did it better, yo.
Entertaining enough, sure. Just not really a must-read.