Four students meet in a school basement to pull off their first ridiculous scheme: hijack the bell. It should have been brilliant. Instead, the basement answers back.
The basement under Shine High School smelled like dust, damp concrete, and old secrets. That was perfect, according to Lena, who had declared it the official headquarters of the Strangest Ideas Club. It was less perfect that the club also had to pretend, every lunch break, that they were "looking for lost textbooks" so the teachers would keep believing they were normal.
Marek arrived first, carrying a battered speaker cabinet tucked under his arm like contraband. He set it down beside a crate of pickles and grinned as if he had not, at some point this week, turned Anna's phone into something suspiciously close to a hair straightener.
"If this works," he said, "the school bell will sound unforgettable."
"That depends on whether you mean unforgettable in a good way or in a way that gets us expelled," Anna said, folding her arms.
Kacper slipped through the basement door a second later, breathless and already checking the hallway behind him. "We have seven minutes. Maybe six. The caretakers are supposed to be on the far side of the building, which means they are either gone or about to appear exactly here out of spite."
Lena tapped the clipboard in her hand. As club president, she liked to pretend the club had structure. The clipboard helped. So did speaking in a tone that suggested she had not agreed to this because she was curious, bored, and mildly concerned for her own future.
"Final version," she said. "We intercept the bell signal, reroute it through Marek's device, and replace the usual sound with something unexpected. Not terrifying. Not illegal. Just memorable."
Anna gave her a look. "Those three words have never belonged in the same sentence."
Marek crouched beside the electrical box they had definitely not been allowed to open. He adjusted a coil of wires with the solemn focus of a surgeon, if surgeons worked by guesswork and optimism.
"You people have no faith," he muttered. "I have tested this three times."
"You tested one version," Kacper said. "The version that made the radio emit static and smell like burnt toast."
"That was a different circuit."
"That sentence is not reassuring," Lena said.
Marek ignored them and reached for the panel.
For one suspended second, the basement held its breath. Then a sharp chime cracked through the room, not from the school bell overhead but from somewhere inside the walls themselves. Everyone jerked upright.
A voice followed, flat and perfectly calm, echoing through the basement speakers:
"Hello, intruders. You have been spotted. Please remain calm and await further instructions."
No one moved.
Kacper slowly slid his phone into his pocket.
Anna stared at the speaker cabinet as if it had personally betrayed her.
Lena turned to Marek.
Marek, who had one hand still on the wires, looked pale for the first time in his life.
Then, from the dark corner behind the boiler, something clicked on.