Book 5 in the Indian in the Cupboard series.

He felt a draft of cold air. Instinctively he put his arms around his body. Then he looked down at himself and got a shock. He was naked…His first instinct was to hid. he scrambled over the earth floor of the longhouse and ducked under the curtain. Beyond was deeper darkness, but he could make out a sort of room with a raised section against the wall. On this was a mountain range covered with fur, in the shape of a sleeping giant.

Omri stared all around, feeling the beginnings of panic. “Dad!” he whispered as loudly as he dared…

There was no answer. Omri felt intensely vulnerable with no clothes on. Cold air embraced his skin from head to foot. He felt a sudden longing to go home. He hadn’t reckoned on this–being separated from his dad, it being so dark and cold, so strange, so lonely.