Fracture Point. The Gemini Project, #2

Some doors open onto places you never expected. Some answers cost more than the question was worth. Fifteen-year-old Maddie Harris thought she'd won. She exposed the leader of Project Gemini, kept the portal device out of enemy hands, and earned a fragile peace. But her father is still a prisoner - and the people holding him aren't done. Gemini has new leadership, someone methodical, patient, and far more capable than the man Maddie put behind bars.
They're not coming for her. They don't need to. They already know where she lives, where she goes to school, and who she cares about. And they're watching. Always watching. With her father days away from being transferred to a location she may never find, Maddie must do what she does best: code, adapt, and outthink people who've been doing this longer than she's been alive. But the closer she gets to finding him, the more she realizes that the people she trusts may be keeping secrets of their own.