The events take place between the end of S3 and the beginning of S4.

After enduring long torment in the dungeons and Lenore’s betrayal, Hector began to grow slowly stronger in his role as a slave. Within a week, he had devised a way to create a passage to Carmilla’s chambers and had even made contact with Dracula’s loyalists. But on top of all this, he still carried the weight of his strained relationship with Lenore and his lack of respect among the castle’s inhabitants.