In the early days of their marriage, his wife would hum cheerful tunes every day. Lately, however, their life had grown stale, their sex life dwindled, and along with it, her humming had faded away. Then one day, as she stood doing dishes in the kitchen, she began humming again—just like she used to, after years of silence. The sound brought a sense of warmth, making it seem as though her mood had brightened recently. To him, the melody felt comforting, even pleasant. But one day, while talking on the phone with his best friend, he suddenly heard that same humming through the receiver. This time, the once-soothing tune struck him differently—like a secret signal of infidelity—and it began to stir deep unease within him.