Jenny Angell, a university professor, is a bit screwed when her rat bastard boyfriend takes off leaving her penniless. Though she considers various other ways to supplement her meagre teaching income, the one that she eventually opts for is, as the title would suggest, that of call girl. Assuming the persona of Tia (an abbreviation of her college nickname, Tia Maria), she signs up to an agency who quickly have her working every night.