Managed to find Beren and Lúthien in the library! My little daughter was throwing a tantrum so I thought I would just pick the first book that doesn't look stupid and leave. And just as I decided it I saw Beren and Lúthien! It was a miracle lol. So now I'm reading it and it's so interesting how the story has evolved over time. But it doesn't explain why did Tolkien abandon some characters. For example why did the cats have to go? And what about Thû?