On the morning the river ran backwards, no one thought to write it down. They filmed it instead. Within minutes, thousands of videos appeared online. Within hours, millions. Experts analysed currents. Influencers posed beside the water. One man sold jars labelled BACKWARDS RIVER WATER until police discovered he filled them from his kitchen tap. Then someone noticed something strange. Every video had the same flaw. Eight seconds were missing. Not blacked out. Not corrupted. Simply absent. A recording lasting one minute showed only fifty-two seconds on playback. Physicist Lena Marlow arrived two days later. She synchronised fifty cameras along the river. Again, eight seconds disappeared. But audio equipment recorded something the cameras did not. Music. Faint, distant and impossible to locate. Lena isolated the sound and sent it to the city orchestra. They reconstructed the melody. Seven notes. Then silence. Then the recording resumed. The orchestra's conductor became obsessed with finding the eighth note. For weeks, musicians tested every possibility. A-flat. C-sharp. Notes outside conventional tuning. Nothing matched. Finally Lena attended a rehearsal. “Play the recording again.” They did. Seven notes. Silence. She closed her eyes. “That's not a gap.” The conductor stared at her. “Of course it is.” “No. The silence lasts exactly eight seconds.” They performed the melody beside the river the following morning. After the seventh note, every instrument stopped. For eight seconds, nothing happened. Then the river reversed direction again. This time, every camera captured everything. The mystery hadn't been eight seconds disappearing. People simply hadn't understood that nothing could also be an event. The orchestra finally agreed the missing note had been there all along.