"Why should Mayes need to send his confederate instructions by written note? We know the nature of his hold over his subordinates, and we know that it means personal communication. Also, the cheque was in Mayes's own hands last night. More, Mayes knows very well that I have read that cypher--has known it for some time; otherwise how could we have discovered the bonds in the case of the Lever Key? Also, Mayes knows that we have his cheque-book and know his bank. Didn't I assure you we were watched last night? I believe he knows all we have done. In such circumstances he might risk his jackal's liberty by sending him on the desperate chance of cashing a cheque, but, knowing the risk, he would never have let him come with information on him. And least of all would he have let him come carrying a vital secret written in that very cypher which he knows I read many weeks ago. And then see how that message, instead of being concealed, was positively brought to your notice! That man Broady Sims is a cunning rascal, and the police know him of old as a skilful swindler and bill-forger. A man like that doesn't get rid of a compromising scrap of paper by trundling it out under your nose just at the moment he is arrested, when the attention of everybody is directed to him; no, he would wait his opportunity, and then he would probably slip it into his mouth and swallow it. As it is, he would seem to have succeeded in dropping this paper full in your sight, with an elaborate pretence of secrecy. Now this is what has been done, Brett. That man has been sent to cash a cheque, with very little hope of success, or none, because the first move that Mayes would anticipate on our part would be the watching for him and his cheques at the bank in Upper Holloway. If by any chance the cheques had been cashed, well and good, no harm would have been done, and then Mayes could have gone on to arrange for drawing the rest of his balance--could probably have quite safely come himself to draw it. But if on the other hand, as he fully anticipated, Sims was arrested, what then? Nothing was lost but a penny cheque-form, and even Sims--though Mayes would care nothing about that--could only be searched and then released, for the cheque was perfectly genuine, and there was no charge against him. But since he would certainly be searched, that cypher note was given him, with instructions to make a conspicuous show of attempting to get rid of it. Now that note was written in a cypher which Mayes knew was as plain as print--to whom? To _me_. I am on his trail, and this note is deliberately flung in my way, open as the day, but with every appearance of secrecy. I am his dangerous enemy, and he knows it--as he told you, in fact, yesterday. If he can clear me away, he can take breath and make himself safe. The purpose of this note is to induce me to go, alone, to this place on Channel Marsh to-night at twelve, in the hope of learning where to find Mayes.