Josie is assigned to mystery-shop a chain of lingerie stores, and she's surprised to find her high school gym teacher, Mrs. Hayes, working as a shop manager and "C-cup counselor." Even worse, Josie finds a high school acquaintance murdered in a restroom near the shop, her hands bound with the bra she just purchased. Thanks to a secret from her past, Mrs. Hayes has a motive for this murder, and a flimsy alibi. Josie has to find the real killer to save Mrs. Hayes.