Books by Nykko

To stay alive and return home, Rebecca and her friends must strike the Master of Shadows at the source of his powers, a crumbling castle fiercely guarded by the Shadow Spies.

Rebecca, convinced that she will die if she does not return to the other world, enlists the help of Theo and Noah to open a new passageway, but once on the other side they fall into danger and Max, unaware of the peril, follows.

After discovering that Grandpa Gabe has sealed the passageways between worlds, Max, Rebecca, Theo, and Noah must confront the Master of Shadows himself to find another way home.

"Lexile level: 350"--Publisher's website.

"Lexile level: 300"--Publisher's website.