I, Ruin

In 2294, Cascade Andronica is attending the requisite final year of school in the once-so-vaunted Americas, now united under the governing hand of the Coalition. She plays the obedient daughter, keeping her assassin training secret, keeping her best friend safe, and fantasizing in secret about Lunar Davith Adurian, the scarred, smirky guy who's always nearby, pausing in a space of heat behind her, his breath near her hair while dusky blushes grace her skin.
Then the mutation comes.
It leaves them writhing on the classroom floor, no breath, no scream... until feathers of vivid hues unfold from their shoulders and whisper over their skin. Cascade staggers up along with the other students, dazed and disoriented, but then their professor's wings swarm with spiders and-
She leaves him dead on the sun-drenched floor.
Now on the run with Lunar, she needs to keep it together to wage an underground war against the Coalition, but inside, she's coming apart. Her father wants her to abandon her best friend. Lunar challenges her every step and antagonizes the rebellion she's supposed to control. She starts making mistakes as she struggles to hold everything in place: to hold her course, her beliefs, to hold herself-
To hold anything at all when her hands are slippery with blood.