“Hello! I was wondering what had become of you two chaps,” cried Frank Andrews, as they rode up to the building wherein they and the assistant and some others had their quarters. “Some let-down you got caught in.”

“I should say so!” cried Roger. “We came within an ace of being drowned.”

“Be thankful that you weren’t struck by lightning,” returned the older engineer, with a twinkle in his eyes. “I suppose you’ll want to get some dry duds on before you make any report about those marks.”

“The marks are all there, just as Mr. Obray expected they would be,” answered Dave. “I’ve got a list of them here in my notebook.”

“By the way, Mr. Andrews, was there a stranger here a little while ago—a fellow about our age?” questioned Roger.

“There was somebody here. I don’t know who it was,” answered the assistant. “He was over at the main office, talking to Mr. Obray.”

“And you don’t know who he was?”

“No.” Frank Andrews gazed at the two chums questioningly. “Anything wrong about him?”

“That is what we want to find out,” answered the senator’s son. “We thought we knew him; and if so he isn’t the kind of fellow that any one would want around here.”

“Why, how is that?” questioned Frank Andrews. And thereupon, in a few brief words, Roger and Dave told about Nick Jasniff and his doings.