Cass knows who she is now, who she had always been.
She opened her locket, unlocked her true essence and with it, returned to her former self.
The Oracle, the only true visionary of Gallifrey.
But her memories are harsh. The reality of what she's been through, of what they put her through haunts her sleep. And with Rose now lost to the other universe, there's nothing keeping her from falling in, from losing herself.
Except for the Doctor, her tether, the one thing holding onto her so tightly, keeping her from tumbling over the edge of oblivion. And when Martha Jones joins them, and new adventures arise...will the Oracle of Gallifrey retain her sanity?
Or will the weight of her foreknowledge and power drag her under, once and for all?