"Just outside the gates, at the end of the path on the right," replied Narkom, halting with Sir Henry and appearing to be wholly absorbed in pointing out the different varieties of tulips.

"Good," replied Cleek, apparently taking not the slightest notice. "I'll toddle on presently, and when you return from inspecting the flowers you will find me inside the motor awaiting you."

"Do, old chap, and please hurry; time is everything in this case. Let me introduce you to your client. (Keep looking at the flowers, please, Sir Henry.) I have the honour to make you acquainted with Sir Henry Wilding, Cleek; he needs you, my dear fellow."

"Delighted—in both instances. My compliments, Sir Henry. By any chance that Sir Henry Wilding whose mare, Black Riot, is the favourite for next Wednesday's Derby?"

"Yes, that very man, Mr. Cleek; and if——"

"Don't get excited and don't turn, please; our friend the policeman is looking this way. What's the case? One of 'nobbling'? Somebody trying to get at the mare?"

"Yes. A desperate 'somebody,' who doesn't stop even at murder. A very devil incarnate who seems to possess the power of invisibility and who strikes in the dark. Save me, Mr. Cleek! All I've got in the world is at stake, and if anything happens to Black Riot, I'm a ruined man."

"Yar-r-r!" yawned the elderly sea captain, rising and stretching. "I do believe, constable, I've been asleep. Warm weather this for May. A glorious week for Epsom. Shan't see you to-morrow, I'm afraid. Perhaps shan't see you until Thursday. Here, take that, my lad, and have half-a-crown's worth on Black Riot for the Derby; she'll win it, sure."

"Thanky, sir. Good luck to you, sir."