Why is Catarella allowed to have any part in the operation of the station? He'd be an encumbrance even if moved to toilet-cleaning duties. Why does Montalbano never seem to have any means of communicating with the rest of the force on him? It's not that he can't get a signal since he's never shown to try! Why does he appear to operate outside the rest of the force in his own time and to his inclinations? He's more like a private eye than a policeman. Catarella is almost certainly a “raccomandato”, i.e., someone who got his job thanks to connections rather than going through a rigorous interview and testing process (in Portuguese would be harder to translate; I don’t there’s a noun for that; for the action, yes; it’s called “meter uma cunha”, meaning literally “to pull strings for somebody”). It happens an awful lot. But Catarella does crack computer codes, week in week out, so he's good at something!
If you're into Mediterranean Crime Fiction, read on.