Chapter 9: Not the books again

When John cleaned the coffee table on Saturday morning he found a note from Sherlock that looked exactly like those of their cipher game. It read 68-1 59-25 64-17 56-11 98-3 68-31 9-10. It reminded John of the book cipher from the Black Lotus, in this case it had to be a book from around a 100 pages.
Just in case Sherlock was being sneaky, thinking John would overlook this option, he started with the London A-Z. The result was rubbish.
Several hours and books later Sherlock came home from Bart's, before he could remove his coat John yelled: "Which book did you use I've been stuck on it since this morning!"
Sherlock raised an unimpressed eyebrow and calmly replied. "Those are the doodles I made calculating the results of my last experiment." John didn't know if he wanted to shout about the time he wasted or laugh about Sherlock using the word doodles. In the end he settled for sighing and claiming that he was never playing this bloody game again as long as Sherlock kept making cryptic notes of his experiments. Sherlock just pouted at his back, when he walked away to make tea, disappointed that the game was over.

The end.