Chapter III: ――Arithmetic

He had a clue! But what was a clue in so wild a maze as the great London? In Paris the police would have found her, In London there were, at that time, no police. They were “reserved forces,” and had been called out in case of war! When so used there are no police. The authorities then make constables of the prisoners. It is a maxim of English law, “Set a thief to catch a thief.” But Miss Lade was not a thief――except that she had stolen the heart of Tom Harry! This was not a legal felony――therefore the police could not catch her! The clue was a piece of paper found in her room in Paris. On it was written the number “31” and “London.” That was all!