They have grown up in Shadow, ignorant and safe.
Until now.
Now they have to learn to deal with change, and learn fast.
There's an angry uncle to cope with.
There are hordes of chaosians chasing them down.
There are metaphysical conundrums, which are best explained using two mugs of beer.
It could be infernals; it could be psychedelic warfare, it could be a long adventure with some great loot at the end.
Whatever it is, they're in it up to their necks.