The London Eye Mystery

Knowledge can be like the skin on the surface of the water in a pond, or it can go all the way down to the mud. It can be the tiny tip of the iceberg or the whole hundred percent.

Salim,' She said, as if he were in the room. 'I'll have your guts for garters.' I has never heard this before and wondered what garters were. Kat told me later that they are what women used to wear around their thighs to keep their stockings up and they were elasticated. I do not think guts would be a tidy way of doing this.

Kat had her arms folded and her hair was tied in what girls call a topknot. Her skinny, bony face jutted out. With her tilted chin and dark eyebrows she seemed sharper, somehow, as if she was more in focus than other people round her, or more real. You couldn't help noticing her, whether you were looking for her or not. Maybe that's what being pretty meant, I thought.

Lips up, loads of teeth showing = very amused, happy. Lips up, no teeth showing = slightly amused, pleased. Lips pressed together, slightly turned down = not amused, slightly cross, or else puzzled (hard to tell which). Lips pressed together, eyes scrunched up at the same time = very displeased, angry. Lips round like an O and eyes wide open = startled, surprised.

The difference between laughing your head off and shouting your head off is that with one you are happy and with the other you are angry.

Everyone laughed their heads off, which is not what literally happened but I like the idea of laughing heads becoming detached from bodies through extreme hilarity, so it was a good way to describe things.

The world's most famous fictional detective, Sherlock Holmes, said that once you have eliminated all the possibilities, whatever remains, however improbable, must be true.