A stormy night. A strange signal. A secret that could change everything. When twelve-year-old Arjun Mehta , a curious tech whiz, builds a homemade antenna in his small hill town of Kalkeri, he never expects to hear anything unusual. But one wild monsoon night, through the static and thunder, he intercepts a mysterious transmission. With his fearless best friend Diya Nair and his loyal dog Rocket , Arjun sets out to uncover where the signal came from—and why it was hidden. Their search pulls them deep into the misty Nilgiri Hills , where secrets lie buried in abandoned towers, forgotten tunnels, and journals left behind by vanished scientists. But they are not alone. Someone—or something—is watching them, determined to keep the truth hidden at any cost. Will Arjun, Diya, and Rocket solve the puzzle before the storm closes in? Or will the hills keep their mystery forever? Perfect for readers aged 8–13 who love mysteries, suspense, and heart-pounding adventures , this gripping tale of friendship and courage will keep you turning the pages late into the night.