"Two men in the house!" "I can't explain now, but it is very important that we prevent their escape." "Burglars! We were all over to supper at wife's folks--" "Spies, fits the case better, sir--some rival road spite work, maybe. It's serious, as I shall explain to you later." "There they are. Hey, stop!" Two figures had cut across the lawn from the rear of the house. "They are the same men," declared Ralph, and both he and the paymaster put after them. The fugitives paid no attention to the repeated demands of the paymaster to halt. They crossed a vacant field and suddenly went clear out of sight. "They've dropped over the wall guarding the north tracks," said Ralph. "And we'll follow!" declared Mr. Little dauntlessly. At this point the north branch of the road ran down a steep grade and was walled in for over a thousand feet. Ralph dropped onto the cindered roadbed. Mr. Little more clumsily followed him. "Where now?" he puffed, as he scrambled to his feet. "There they go," said Ralph, pointing towards two forms quite plainly revealed in the night light. "I see them," spoke the paymaster. "They're caged in." "Unless they take to the tunnel." "Then we'll take to it, too," insisted Mr. Little. "I'm bound to get those men." Ralph admired the pluck and persistency of his companion. The paymaster was a big man and a brave one. He had the reputation of generally putting through any job he started on. The young railroader did not entirely share the hopes of his companion, as he saw the two fugitives reach the mouth of the tunnel, and its gloom and darkness swallowed them up like a cloud. "The mischief!" roared the paymaster, going headlong, his cane hurtling through space as he stumbled over a tie brace. "I've sprained my ankle, I guess, Fairbanks. Don't stop for me. Run those fellows down. There's bound to be a guard at the other end of the tunnel. Call in his help." Ralph grabbed up the cane where it had fallen and put sturdily after the fugitives. The tunnel slanted quite steeply at its start. It was about an eighth of a mile in length, and single tracked only. Ralph was not entirely familiar with running details on this branch of the Great Northern, but he felt pretty sure that there were no regular trains for several hours after six o'clock. The men he was pursuing had quite some start of him, and unless he could overtake them before they reached the other end of the tunnel they were as good as lost for the time being. Ralph's thought was that when he had passed the dip of the tunnel, he would be able to make out the forms of the fugitives against the glare of the numerous lights in the switchyards beyond the other entrance. The young railroader retained possession of the paymaster's cane as a weapon that might come in handy for attack or defense, as the occasion might arise.