These comments are based on watching the first season.
This Italian crime drama is set in the northern city of Turin and centred on Valeria Ferro. She is a detective investigating various 'murders of the week'. These tend to feature more personal motives rather than murders that take place as part of another crime.
As well as these murders there is an ongoing storyline regarding Valeria's mother. Early in the series she is released from prison having served seventeen years for the murder of Valeria's father. She has never denied the crime but her former cell mate claims she is really innocent. Valeria initially wants nothing to do with her mother but inevitably gets drawn into looking into the case. Things are somewhat complicated by the fact that her boss, who she is involved with, arrested her mother.
I really enjoyed this series; the cases of the week very much dominate the episodes but the ongoing story regarding her mother nicely serves to link the episodes and make key characters more interesting. The weekly cases are interesting and the identity of the killer isn't obvious. There are always plenty of suspects and motives to keep the viewer guessing.
Miriam Leone is solid in the role of Valeria and the supporting cast also impresses. I liked the setting; the only other Italian shows I've seen have been set further south, mostly way down in Sicily... this feels like different country. Overall I'd definitely recommend this to fans of subtitled crime drama... assuming you don't speak Italian! I hope we don't have to wait too long before season two becomes available here in the UK.