A few months ago (maybe as many as five) I read they synopsis of a book about sisters. One had been missing for years and then suddenly turns up. Everyone is pleased to see her... except the sister, who isn't convinced that the returnee is who she says she is.
It's not Girl, Missing by Sophie McKenzie or Sister by Rosamund Lupton.
I'm not sure if it's the type of book I would normally read, but it's driving me mad trying to find it!
Thanks in advance.