The Vanished (Shuri: A Black Panther Novel #2‪)‬

Shuri, the Princess of Wakanda (and sister to the Black Panther), sets out to save a group of kidnapped girls in this all-new, original middle-grade novel by New York Times bestselling author Nic Stone!
With the heart-shaped herb thriving, a group of Wakanda's finest engineers working on expanding her dome technology, and the borders more fortified than ever, Princess Shuri can finally focus on what matters most: her training.

Soon, a bigger problem rears its head. The princess hears whispers of exceptionally talented young girls across the world going missing. A young environmental scientist in Kenya, a French physics prodigy -- the list of the missing keeps growing and growing. And when this mystery hits home in a way the princess would've never expected, there's no more time for hesitation: There are lost girls out there somewhere, and Shuri is determined not to let them be forgotten.