The lamp flickers three times, pauses, then twice more. I wait in the darkness of the lighthouse tower, my hand trembling on the signal mechanism, watching the black water below. Then it comes—the response I've been waiting for and dreading in equal measure. Deep beneath the surface, something glows. Three pulses of bioluminescent blue, a pause, then two more. Exactly matching my pattern. "You're insane, Morgan," I whisper to myself, but my heart races with the thrill of it. "Completely insane." It's been forty-three days since I first noticed the lights answering back. Forty-three days of secret conversations with something that shouldn't exist, something that defies every rational explanation I've tried to construct. I'm supposed to be keeping ships safe, not playing cosmic telephone with the abyss. The wind howls around the lighthouse tower as I grab my journal, flipping to today's page. I've been documenting everything—every pattern, every response, every evolution in our communication. What started as simple mimicry has become something far more complex. The entity below has learned to initiate contact, to create new patterns, to ask questions I'm only beginning to understand how to answer. I signal again: five short pulses. The mathematical sequence I've been teaching it. The response comes faster now: five pulses, then eight, then thirteen. My breath catches. Fibonacci sequence. It's not just mimicking anymore—it's demonstrating understanding, showing me it comprehends the mathematical relationship. "What are you?" I breathe, pressing my forehead against the cold glass. The lighthouse has been my refuge for three years, ever since the accident that killed my research team. Ever since I decided humanity wasn't worth engaging with anymore. But this—this is different. This is first contact with an intelligence we never knew existed, and I'm the only one who knows. The isolation that drove me here suddenly feels like destiny. I'm about to signal again when headlights cut through the darkness below. A car winds up the narrow coastal road toward the lighthouse. At this hour? No one comes here. That's the entire point of this posting. My stomach drops as the vehicle parks and a figure emerges, pulling equipment from the trunk. Even from this distance, I recognize the setup—sonar equipment, marine research gear. No. No, no, no. I kill the signal lamp immediately, plunging the tower into darkness. Below, the ocean pulses blue three times, then three times again. Questioning. Confused by my sudden silence. I'm sorry, I think desperately. Not now. The knock on the lighthouse door echoes up the spiral stairs fifteen minutes later. I consider not answering, but whoever this is saw my lights. They drove all the way out here for a reason. I descend slowly, each step feeling like a betrayal of the secret I've been keeping. When I open the door, a woman stands there, rain-soaked and determined. She's younger than me, maybe early thirties, with dark hair plastered to her face and eyes that spark with scientific fervor I recognize all too well. "Morgan Reeves?" she asks. "I'm Dr. Amara Chen, Pacific Marine Institute. We need to talk about what's happening in the water off this coast." My blood turns to ice. "I don't know what you mean." "Really?" She pulls out a tablet, showing me sonar readings that make my heart stop. The screen displays rhythmic patterns in the deep ocean—patterns that pulse in sequences I recognize. Our sequences. "Because these readings suggest something is communicating. And your lighthouse is the only structure sending signals into this particular section of ocean." She looks up at me, and I see she already knows. "What have you been talking to, Mr. Reeves? And why have three ships disappeared in the last week?"