This book is number 7 in the Montalbano series. 007 might be more apt, though. For the intrepid Inspector plays the all-action hero as well as the all-divining intelligence when bringing his crooks to justice.
Despite the leavening humour and some classic Catarella malapropism (his ability to murder language is described as 'Catarellese'), this particular story features a more embittered and sadistic Montalbano to the one we've got used to. He seems to feel the world's weight on his shoulders here, troubled as he is with human-trafficking, loan-sharking and, generally, the stinking underbelly of a sordid humanity: 'The world's become too evil', is the conclusion of an eye-witness that could equally be his own. For the most part, Salvo operates in defiance of his team and relations with his trusty deputy Mimì Augello have never been cooler.
Even Stephen Sarterelli's usually assured translation seems different: incomplete, even Catrellese in its English (Montalbano 'gives into rage' instead of giving in to - so much for phrase verbs!), while expressions like 'Avast!' do not have the usual annotation and leave me, for one, bemused.
So, rather too much James Bond and not enough vintage Camilleri for my liking, but Rounding the Mark is still, ultimately, Camilleri: never less than entertaining.