Paula’s suspicious behavior
Paula, my future monster-in-law, had been at our home only a day before. She had excused herself to go to the bathroom, taking her bag with her.
However, to my surprise, I had seen her climb the stairs to the upstairs bathroom instead of just taking the one on the ground floor.
Though it wouldn’t be enough proof to convince my fiance, Mark, it was enough evidence for me to just know it.