I put my hand on the wall for support. Susie turned, saw me, and hung up so quickly that the receiver fell back onto the cradle.
“Who are you talking to?” I asked cautiously.
He didn't want to meet my gaze.
“Wrong number,” he said before running upstairs.

An 18-year-old girl walks up the stairs | Source: Mid-course
I stayed there for a long time, my heart pounding and my mind racing.