A Clue to the Secret Book

I heard Mr. Wetbottom in Sleepwood is going through hard times... I should go check him out.

At a VIP sauna in Sleepywood, I met this bald man called Mr. Wetbottom. He has a son, and apparently he ran away from home one day with a book that he cares deeply for. He requested that I find his son and get the book back from him. For a reward, he's offering me a nice sauna robe. He also told me his son Ronnie hangs out at a tree tunnel around Ellinia, so maybe I can find him there. Anyway, is that book more important to him than his son?? What kind of a book is it anyway... ????

I found Ronnie in the tree tunnel, which Mr. Wetbottom asked me to do.