Mirror Island

Captain Crow had a tresure map. The children looked at it.

"It looks odd," said Captain Crow. "I could'nt understand it."

"Look at these funny words," said Biff. "What do they mean?"

"I think I understand it." said Chip. "It's in mirror writing!"

p14,15

I read Mirror Island, a book in the Oxford Reading Tree series.
The magic took the children to the island. And they met Captain Crow. He wanted to find the treasure, but he didn't understand a treasure map. When Chip put the mirror on the map, Captain Crow could read the writing.
I thought the map was interesting.

Hunt, R, & Brychta, A. (2003). Mirror Island. Oxford Reading Tree.