Haunted by a creepy ghost boy (or a monster!)

Roe, Sally and Arthur recall a memory in which they went into a creepy, supposedly haunted house. Lu, Frank and Sebastian are convinced Roe hired them to investigate that house. Katie, a new reporter, convinces Sally to write a story on the house. And Aida recalls rumours about kids making a creepy discovery about the house in the 1980s. Guess what... they're true.