What actors and actresses appeared in Guarding the Montalbano - 2012?

You're likely referring to "The Young Montalbano," which is a TV miniseries that served as a prequel to the popular Italian series "Inspector Montalbano." It aired in 2012.

The main actors in "The Young Montalbano" were:

* Michele Riondino as a young Salvo Montalbano

* Sarah Felberbaum as Livia Burlando

* Alessio Vassallo as Fazio

* Peppino Mazzotta as Mimì Augello

* Angelo Russo as Catarella

* Cesare Bocci as the older Salvo Montalbano (appearing only in the final episode as a brief cameo)

This list doesn't include all the actors and actresses who appeared in the miniseries, as it featured many other supporting characters. But these are the main stars who played the most prominent roles.