The Radio Signal from Mars. Dark Space, #5

Dark Space #5 The signal wasn't meant for Earth-but now it's inside everything. When Leo picks up a strange transmission on his grandpa's old radio, he thinks it's just static. But the voice that repeats his name doesn't sound like noise. And when his best friend Max starts acting weird-and mold begins growing where it shouldn't, Leo and his sister Andi realize something is listening back. As their town slips into silence and the people around them begin to change, Leo and Andi uncover a buried network pulsing beneath their feet, built from memory, thought, and something not quite human.
The transmission didn't come to destroy Earth. It came to join it. Perfect for fans of Goosebumps and Stranger Things, this creepy, fast-paced sci-fi horror story is packed with eerie mystery, wild twists, and the kind of danger you can't run from because it's already inside you.