"If you want to find Cherry-Tree Lane all you have to do is ask the Policeman at the cross-roads. He will push his helmet slightly to one side, scratch his head thoughtfully, and then he will point his huge white-gloved finger and say: "First to your right, second to your left, sharp right again, and you're there. Good-morning." And sure enough, if you follow his directions exactly, you will be there — right in the middle of Cherry-Tree Lane, where the houses run down one side and the Park runs down the other and the cherry-trees go dancing right down the middle. If you are looking for Number Seventeen — and it is more than likely that you will be, for this book is all about that particular house — you will very soon find it."