Circles of Separation (Book 3 of Waldmeer): Fork in the Road

Vera stood very still. She listened carefully to Mullum-Mullum. She did not want to miss any of the few words he was giving by way of instruction. In his customary style, Mullum-Mullum spoke in a meaningful but mysterious manner,

Think not you can return
on the path that leads to the fork.
Taken once, it disappears

as the choice lies ahead.
Both roads will lead to somewhere,

but one will be to nowhere.