The story can be found here
"The penny was gone again.
Caro huffed and dropped her grocery bags in the hall. She reached in, took a penny from the change bowl by the door, and rubbed it between her thumb and forefinger, said Nana’s charm for the house spirits, to keep them happy and home.
She blew on the penny and tucked it down by the threshold.
Five days she’d lived here, and seven times the penny had been gone, either in the morning or after she returned from an errand. The apartment didn’t set off her Spooky Senses, but the penny thing was weird."