“Now,” said Dorothy, “we may follow. I knew they were up to something big.”

“Aren’t they too funny!” said Mabel, who had almost giggled disastrously as the boys passed. “I thought I would die!”

There was no time to spare now, for the boys were walking very quickly, and it was not so easy for the girls to keep up with them and at the same time to keep away from them.

Straight they went for what was locally called the “haunted” house. This was a fine old mansion, with big rooms and broad chimneys, which had once been the home of a family of wealth. But there had been a sad tragedy there, and after that it had been said that ghosts held sway at the place. It had been deserted for two years, but now, with the former owner dead, a niece of the family, fresh from college, had insisted upon being married there, and the house had been accordingly put into shape for the ceremony.

It was to be a fashionable wedding, at the hour of six, and people had kept the station agent busy all day inquiring how to reach the scene of the wedding.

Lights already burned brightly in the rooms, that could be seen to be decorated in holiday style. People fluttered around and through the long French windows; the young folks, boys and girls, being hidden in different quarters, could alike see something of what was going on in the haunted house.

“They’re coming!” Dorothy heard Nat exclaim, just as he ducked in by the big outside chimney. The broad flue was at the extreme end of the house, forming the southern part of the library, just off the wide hall that ran through the middle of the place. Dorothy and Mabel had taken refuge in one of the many odd corners of the big, old fashioned porch, which partly encircled this wing, and commanding a wonderful view of the interior of the house, the halls and library, and long, narrow drawing room.

There was a smothered laugh at the corner of the porch where the boys had ducked, and the girls watched in wonder. The latter saw Nat boost Ned up the side of the porch column, and Ted followed nimbly. In tense silence the girls listened to their footsteps cross the porch roof, then as scraping and slipping and much suppressed mirth floated down.

“They’re going down the chimney!” declared Dorothy, in astonishment.

“They surely are!” affirmed Mabel, leaning far over the porch rail.