Ideas, ideas...

Okay, so we need an idea to tell us how Kass and Lailie are going to meet and such. This is something I've come up with:

So there's this rumor about the Underworld that if you stand on the tallest tower in the Underworld while in the land of the living it's a night with a full moon, the line between the two world becomes to blurred one could simply jump over it and lend up in the land of the living.
Kass, being a shade and having the ability to swap dimensions, while he can't actually jump because of the magic that holds him to the Underworld, he can still see what the land of the living is like.
So, Kass catches wind of the rumor, sneaks away to the tallest tower and waits for the moon the rise up completely in the sky on the other side. Meanwhile, the tallest tower in the Underworld is the same tower of which Lailie's master lives in. So Lailie runs up to the top of the tower, trying to get away from the hordes of men that are coming after her. She reaches the top and is running so fast that she can't stop. Just as Kass using the weakness in the Underworlds magic to shift worlds, Lailie bumps into him and they both teleport to the land of the living.
Lailie is thankful to Kass, because of him she was now free of torment, but none-the-less she would rather be rid of him. So they both go their spererate ways. But (but because we need to force them to stick together) because of how they teleported, they can't go more then a mile away form one another. So they have to trek all the way back to meet one another and we can just sorta go on form there :D