I spent the first few chapters of this book sulking because there was no Bianca and Adrian but when I got into the story I realised that Lina and Marcello are just as amazing. I spent the story making wild guesses about what would happen (and what may have happened in the past) and was pleasantly surprised to realise that I got a number of them wrong.
This book is dark (more so than many other mafia books that claim darkness) but if you can stomach that then it's a really rewarding read.