2.5, rounded up. Being a Dr Who fan who loves murder mysteries, I eagerly got all of Maureen O'Briens books years ago - and they've sat on my shelves ever since. Having read this one, the rest may stay there. It's not a bad book, by any means, but it's not much of a detective story either. To be honest, the final 70 pages drag somewhat, and the ending isn't great. Worth adding to your collection if you're a Dr Who nut, as I'd imagine these are quite collectable by now. I may eventually give book 2 a go to see if they improve, but not for a long time - she was much better as Vicki than an author.