Ratgirl, a diffident 19 year-old woman, as she and her older roommate Alice discover their apartment is infested with rats — a claim which is adamantly ignored by their miserly landlord. Over the course of a hellish fourty-eight hours, Ratgirl unconfidently navigates sexual harassment, housing instability, ex-friendships, and suppressed mental illness.

A writer decides to stay in Montreal over Christmas to work on her book, despite her parents' wishes she come home to Halifax. Alone in her apartment on Christmas Eve, she orders oysters from a dubious online delivery service and soon begins to suffer from more than just homesickness.