But suddenly he stopped his rapid flow. He made a slight movement with his finger, and stood listening. I heard nothing except the voices lower down the stairs and the general hum in the room we had just left. But Mackie did. "Hear that?" he said. "What?" I asked. "Sssh!..." I told you how the wooden partition at the head of the stairs, that with the small window high up, separated the landing on which we stood from the old ledger-room. The window was worked with cords on a horizontal pivot, and was swung partly open. Whether Mackie heard whatever he did hear through this window or through the boards themselves I do not know, but a smile came over his face. "It's that young devil," he whispered. "Who?" "Why, young Merridew. He's in there with somebody...." I invite you to notice that I was improving. I was not eavesdropping this time--I was merely letting Mackie do my eavesdropping for me. He glanced round to see whether the women below were watching, and then set his ear against the partition. "Yes, it's Merridew," he chuckled. "Nice father's hope and mother's joy _that_ young man's getting! I don't suppose he's gone in there to talk to the secretary bird!..." I found myself suddenly reminded of what I had noticed for the first time only an hour or two before--that the room beyond the partition was practically unlighted. Then Mackie dropped again into the "bright" style affected by the singers of comic songs at smoking concerts. "Ahem--good-hevening, ladies and gen'lmen! How am I? Very well, thank me! Ahem! I will now, with your kind permission, endeavour to entertain you with a few of my well-known impersonations on a subject that will appeal to all of you, no matter what your age, sex, condition, vaccination marks or the number of your dog licence--_London's Lovers_." "Oh, Mr Mackie's going to recite for us!" I heard Miss Windus' cry of juvenile delight from down the stairs. "Please be quick, Mr Mackie--we shall have to go in in ten minutes!" And those below pressed up the stairs to hear Mackie. But I did not stay to hear the "impersonation." I walked back into the general room, and, with a violently throbbing heart, sought the seat where I had written my examination paper. Do you realise what I had just seen? Do you see what had set my heart so thumping? If Mackie was right, and he had really got the cue for his "impersonation" from something that was going on in the ledger-room, young Merridew and Evie were alone in there together.