Grover serves as a messenger of love for a prince and princess separated by a garden wall.

"The chickens at the farm are building a wall, and no one is quite sure why. But they know one thing: the hedgehog that wandered in must be trouble. So all winter they build and build, until they have a wall that towers over the barn. When spring comes, though, they find that everything hasn't gone quite according to plan . . ."--Provided by publisher.

When King Frack and King Frick divide their kingdom with a tall wall, Tamala and her family daringly ascend the wall in a hot air balloon in order to visit relatives who live on the other side. Based on a true escape over the Berlin Wall in 1979.