I think the book is different from The Roman Mysteries because his parents die and then he sets off alone to solve a major mystery whereas in The Roman Mysteries their parents don’t die and they solve the mysteries purely for fun. In ‘Wanted’ Pinky sets off to escape killers, but then starts to do mystery work as a job - and to follow in his father’s footsteps - not just for fun! The fact that it is all sounds more serious doesn’t make it any less exciting.
I think that this book is as good as The Roman Mysteries and is more grown-up. I think it will have up lots more great surprises too as the series continues. I think it’s a great read and recommend it very much.