Waking on the edge of the lake, out beyond the perimeter wall, Brie has to think fast.

She's lost, alone, and surrounded by toxic mist. And soon enough, she'll have other threats to contend with too.

Needing to get back to the city fast, she sets her sights on the High Tower, the beacon that calls her home. And eventually, it's right to the summit that she needs to go.

But first, she's got other business to attend to, business that will take her from the core of Inner Haven to the northern reaches of the underlands.

And as a new enemy is revealed, Brie realizes that her already impossible mission has just gotten that little bit harder.

And the clock is starting to tick faster . . .