The Doctor takes Amy and Rory on a romantic date to sixteenth-century Venice - but, much to poor Rory's horror, thing go of the rails as soon as they arrive. The mysterious Calvierri family are running a sinister school for girls, from which no-one escapes unchanged. Rosanna Calvierri's students have fangs, they can't be seen in mirror's, and they drink humans dry. But even they aren't the worst things stalking the city...