The end of the ghost of the green lady- Judit Masip

Finally the protagonist (Billy) went to the other side of the campus, in the lake, and he saw the light, but after this, the campus has a thief and stole some thinigs, Billy wanted to discover ho was the thief, so he inviestigate. Finally he discover that has a teacher and he teold it to the headman but he was in league with the other and it's very strange everything but I think thaht the author made this because it was exciting and this wasn't boring. I liked the book because it makes you think about what could happen so it's cool.