Christopher is at school and tells Siobhan that his book is finished, because his father doesn´t want him to do any more detecting about who killed Wellington. But he doesn´t allready know who the murder of Wellington is. And Siobhan also doesn´t know anything about Mr. or Mrs. Shears. But she told him that other good books were also very short like “Heart of Darkness” and that in life not all murders were caught.
The next day he sees four yellow cars in a row wich make it a “Black Day”. The following day he sees four yellow cars in a row, too, so on the third day he is allowed to keep his eyes closed on the way to school.