Distant Stars Book 3 by Marinaomi

In the final volume of the Life on Earth trilogy, celebrated cartoonist MariNaomi concludes her tale of growing up, falling in and out of love, and possible alien interventions. Shy, self-deprecating Paula Navarro is coming into her own—and it's making her new girlfriend, Johanna, a little nervous. Paula's former friend Emily Baker is learning to look inward. Brett Hathaway, Emily and Paula's mutual ex-hook-up, is torn about reconnecting with his estranged dad. And Nigel Jones is smitten with his tutor, Claudia—whose disappearance and reappearance remains a mystery to everyone around her. As Claudia and her guardians put the final plan in motion, they'll reveal the truth that links everyone's fate.