This is undoubtedly the least of the series (and is saved from a ** rating by a hair): Fantomas is back to his old tricks, deciding that the time has come to tax the higher echelon of society of a good chunk of their wealth (no doubt the common people would applaud his efforts) - but, by now, the formula had grown pretty tired and the comic relief, regrettably, had practically obscured the romantic couple's purposefulness!
Still, why the setting has been changed to Scotland (of all places) is unclear, especially since Scotland Yard only really comes into play at the very end! What we get, in fact, is a lot of old jokes about ostensibly haunted castles, disappearing corpses and frightened manservants - with Louis De Funes' Commissioner Juve in the thick of it! - which are better suited to a Bob Hope or Abbott & Costello vehicle rather than one concerning the exploits of an iconic criminal mastermind!!; there's even the traditional fox-hunt which Fantomas disrupts by throwing in his own dog (barely disguised in fox furs) as a decoy!
Finally, the master criminal exits by way of a shuttle fired through the castle tower: how he managed to get it inside unobserved (and keep it from being discovered by the owners and their numerous guests, including our intrepid heroes) is anybody's guess! Unfortunately, then, the series ends on a bit of a whimper but it's sheer fun nonetheless and, ultimately, that's what really matters...