Alone

"I think I'll go in alone. It'll be too small of a space for the both of us." said Sarah. Tracie nodded in agreement and the lady behind the desk handed Sarah a square with the number two on it before waving her hand to the empty changing stall. Sarah took the square and walked into the stall locking it behind her.

She was right about it being too small for the both of them with only a metre by a metre of space. Sarah layed the two sets of bras and underwear down on a bench that was at the back of the stall and began to undress. She took her t-shirt off and went to unhook her bra but a sharp cough from the stall next to hers drew her attention. In the wall, a circular portion had been taken out (probably while she was taking her t-shirt off as she hadn't noticed it before) and a small folded piece of paper was being passed through.

Sarah took the note. It read:

'Do you want to earn a few hundred? One knock [no] two knocks [yes]'

Sarah read the note over twice before looking back at the hole.