I don't understand the people who ordered these books. Prue left the show yes, but these are books... so when a Prue plot comes along, why not just make an 11th Prue book, instead of forcing a plot like this on Phoebe?
Like what makes more sense - making another Prue book, or having Prue's employers go - oh, one of our photographer's died, we need her for a story, what if we call up the sister she used some times as an assistant and MAYBE is capable of taking photos too?
They really want you to think that being a photographer is just about the point and click. No skills required. Which is quite insulting.
The story itself is quite fun if you get over the contrivance above, Phoebe isn't a terrible character yet, though both she and Paige appear to have forgotten that Paige could've orbed to Leo, when they couldn't reach him? I don't know. The book feels a bit confused, again, as if it was meant to be Prue and Phoebe (unable to orb) and not Phoebe and Paige. It is also a bit confused about who is the innocent for a while, but turns it around. The overall product is fine, I read it on the train as I commute to work and books like this is perfect for a tired after-work brain.
Like all of these though, this is for fans for sure. Not lukewarm audiences.