Rowan and the Travelers — Emily Rodda

The secret enemy is here.
It hides in darkness,
fools beware!

A mysterious danger threatens Rowan's village, Rin. But who is the enemy? And what is the strange spell that is putting all the townspeople to sleep?

The Travelers, a roaming people who are friends of Rin, might be able to help, but Rowan isn't sure he can trust them. Especially since they tell him that to find the answers to Rin's problems, Rowan must go to the legendary, noxious Pit of Unrin, from which no living thing has ever returned.