Tina Buck

When a ruined map burns a star into Bill palm, his quiet life ends. The mark points to a vanished city that appears only at night and a trial of moving iron pillars that resets every seventeen minutes. Rival seekers close in-brilliant Belinda, inscrutable Clark , and Justin, a prodigy with a past no one saw coming-while rumors spread that the last survivors of Noah's Ark guard the final clue. Every step unlocks power.
Every answer breeds a deadlier question. Empires, federations, and ghosts of old wars converge on the same secret: a doorway that shouldn't exist. Follow the mark. Solve the pattern. Outrun the hunters. Because once the city opens, it won't choose twice.