One Lord of the rings story about. Little thranduil

You, y/n Snow, are a curious witch from America coming to visit England in order to write a book. You plan on discovering the different magical creatures that reside in England rather than your home country and researching them. However, you don't plan on meeting a certain magizoologist named Newt Scamander... And when his beasts start to go missing, can you help to find them again?