It was obviously fastened on the inside.
"Now how can we get in ?" said Bella.
"I don't see," replied Mary Bell, "and I can't think how they locked the door without any key-hole." "Could not we climb in at one of the windows ?" said Mary Bell,--"only they are so high up!" The children looked around at the windows.

They were all too high from the ground for them to reach.

There was, however, a heap of short blocks and boards which the carpenters had left in the yard near the house, and Mary Bell said that perhaps they could build up a "climbing pile" with them, so as to get in at a window.

She accordingly went to this heap, and by means of considerable exertion and toil she rolled two large blocks--the ends of sticks of timber which the carpenters had sawed off in framing the house--up under the nearest window.
She placed these blocks, which were about two feet long, at a little distance apart under the window, with one end of each block against the house.

She then, with Bella's help, got some short boards from the pile, and placed them across these blocks from one to the other, making a sort of a flooring.
"There," said Mary Bell, looking at the work with great satisfaction, "that is _one_ story." Then she brought two more blocks, and laid them upon the flooring over the first two, placing the second pair of blocks, like the first, at right angles to the house, and with the ends close against it to keep them steady.