Vigil Point: Zero Hour

In the wilds of Montana stands a fire lookout tower no one has climbed in decades, its windows dark, its radio silent, its purpose forgotten. When the tower begins flashing light in patterns too precise to be chance, Nathan Graves is the only one who notices, and the only one willing to climb the rusted stairs to find out why. What he decodes is not a distress call or a warning left by the dead. It is a countdown, ticking toward something that was sealed inside the tower long before he was born, something that chose this remote ridge because no one was supposed to be watching.
As Nathan pulls Cole Donovan and Rebecca Holloway into the mystery, the three of them uncover a history of vanished rangers, a town that stopped talking about the tower generations ago, and a signal that seems to know exactly who is reading it. The closer they get to zero, the more the tower seems to be counting down to them.