Request #389 From Martina

I hope you can help me. I’m looking for a book (possibly paperback) that I read as a young teenager around 1977-81. The book was about the murder investigation of a girl(s) whose bones were dumped in a river in rural surroundings. I can’t recall much, but the word(s) “bones” and/or “river” or possibly “white bones,” are in the book’s title. The cover may even show an illustration of a river or underwater scene with bones. As I said, unfortunately. I can’t recall much but I would like to find it and read it again of possible. Any assistance finding this book is greatly appreciated.