"I am very glad to see you, sir," he said to me, "and I hope you will be able to spend the night with me in the signal-box. I must say I don't much relish the idea of tackling the thing single-handed; but with your help, sir, I think we ought to get to the bottom of it somehow. I am afraid there is not a man on the line who will take duty until we do. So it is most important that the thing should be cleared, and without delay."

I readily assented to the inspector's proposition, and Bainbridge and I arranged that we should call for him at four o'clock at the village inn and drive him to the tunnel.

We then stepped into the wagonette which was waiting for us, and drove to Bainbridge's house.

Mrs. Bainbridge came out to meet us, and was full of the tragedy. Two pretty girls also ran to greet their father, and to glance inquisitively at me. I could see that the entire family was in a state of much excitement.

"Lucy Ray has just left, father," said the elder of the girls. "We had much trouble to soothe her; she is in a frantic state."

"You have heard, Mr. Bell, all about this dreadful mystery?" said Mrs. Bainbridge as she led me towards the dining-room.

"Yes," I answered; "your husband has been good enough to give me every particular."

"And you have really come here to help us?"

"I hope I may be able to discover the cause," I answered.

"It certainly seems most extraordinary," continued Mrs. Bainbridge. "My dear," she continued, turning to her husband, "you can easily imagine the state we were all in this morning when the news of the second death was brought to us."