21st Century Brothel or House of Horrors

When a young man pays a visit to a popular brothel, he's in for a rude awakening. Staffed by sentient non-humans, the brothel is in reality a house of horrors that sends him fleeing back to the only people he knows who can do something about it. Skeptical at first, his harrowing description of the place drives them to plan a rescue mission for the dozens of young "women" imprisoned there. Larger than any operation they've ever attempted, the raid will either kill them all or make them famous. This the story of the most important mission in the early days of a fledgling clandestine sentient rights organization... a mission that will change everything.