July Books 6) So Vile a Sin, by Ben Aaronovitch and Kate Orman
So, poor old Roz, eh? Having done due service to the Seventh Doctor for 18 books, she dies in battle defending her high-powered family, one of whom is an even closer relative than she first seems, against a peculiar shape-shifting alien threat. I'm afraid the plot rambled a bit too much for me, but I did like the lifting of the veil to Roz's background - rather as we were told about Turlough back in 1984, only done better this time. Not one of the great New Adventures unfortunately, but an important building block of the (soon to be completed) series.