The Last Signal

The radio tower has stood on the hill behind the Mercer farm for as long as anyone in Ashvale can remember. Sixty feet of rusted steel and dead ivy. Padlocked and silent. Except it isn't silent anymore. When seventeen-year-old Wren Calloway hears a voice transmitting from the tower's base - quiet, crackling, unmistakably old - she starts asking questions no one in her family wants to answer. What she finds in her great-grandfather's hidden notebooks changes everything she thinks she knows about memory, consciousness, and what the people we never knew can leave for us.
Robert Mercer spent thirty-five years building something no one believed in: a device to prove that human minds could resonate with each other across any distance. He never finished the proof. Instead, he encoded it in the signal itself, aimed it sixty years forward in time, and trusted someone would be ready to receive it. That someone is Wren. With the notebooks decoded, an unlikely research partner in Marcus Webb (who is significantly more complicated than he looks), and an uncle quietly unraveling for six months - Wren sets out to finish her great-grandfather's impossible work and discover what it means for the world if he was right."Some frequencies travel further than light.
Some signals are built to outlast the people who sent them."