Ananda is a troubled teen who feels like a misfit at home and at her new school, and her unusual ability to connect with animals makes her feel like even more of an outsider. Still raw from the death of her grandmother, Ananda's dreams are haunted by a long-buried memory that causes her to push people away. Fin is a Tunnel rat who lives in the passages beneath the city, in the dark places humans overlook or despise. Orphaned as a pup, he is the nephew of the Tunnel's charismatic leader, the Beloved Chairman, and is willing to do anything to please his uncle, including becoming his lead henchman. The worlds of humans and rats suddenly collide when Ananda protects Fin during a chance encounter in the market. Neither can foresee how their lives will forever be inextricably linked, but as the Chairman launches a plague war against the humans, both Fin and Ananda wrestle with secrets so terrible that they threaten their very existence. Told as mirroring narratives that reverberate with the effects of buried trauma, and informed by historical accounts of plague and dictatorship, this stunning tale examines what it takes to grasp for light in the darkness and survive the threats both beyond us and within us.