The Trustworthy Loner

Chai doesn't worry about the crazy cat that lives in the forest, or the angry, drunk twoleg who throws bottles at him when he approaches for some food.
But Chai does care about the natural disaster that sweeps everything he has ever loved, away.
Chai goes to the city, hoping for mercy from the alley-cats, and shockingly receives some when he encounters his father, Palepelt, and his long lost half-sister, Mouseheart.

Mouseheart lacks of recognition and doesn't trust her half-brother. If Chai can't earn his sisters trust, the group of city cats may eliminate him from shelter forever.