To Sleep in a Sea of Stars by Christopher Paolini

Kira NavΓ‘rez dreamed of life on new worlds. Now she's awakened a nightmare. During a routine survey mission on an uncolonized planet, Kira finds an alien relic. At first she's delighted, but elation turns to terror when the ancient dust around her begins toΒ move. As war erupts among the stars, Kira is launched into a galaxy-spanning odyssey of discovery and transformation. First contact isn't at all what she imagined, and events push her to the very limits of what it means to be human. While Kira faces her own horrors, Earth and its colonies stand upon the brink of annihilation. Now, Kira might be humanity's greatest and final hope...

How We Became Wicked by Alexander Yates

Synopsis: After the world becomes infested with the singers, there are three kinds of people: the wicked, the true, and the vexed. The wicked have been infected by the wickedness spread by the singers and are out to kill. The true are people who haven't yet been infected. The vexed are a small group of people who are immune to the singers and the wickedness after getting bitten as a newborn.