Archer and Mayweather wake up in a Tandaran detention camp filled with Suliban captives. The warden, Colonel Grat, explains that Archer and Mayweather have stumbled into a security zone, and they had to be detained in order to make sure they aren't Suliban masquerading as another species. Grat assures them that while he's bound by regulations preventing their direct contact with Enterprise, he'll tell them what's going on, and that he'll explain the mistake in a mandated hearing which will garner their release in a few days.
Archer spends his time getting to know his Suliban neighbours. It turns out that these are just run-of-the-mill, ordinary, non-genetically-altered Suliban who have been caught up in a net of fear by the Tandarans and relocated to internment camps throughout Tandaran space. Archer has a problem with that. He becomes increasingly resistant to Grat's questions -- which prompts Grat to threaten to keep Archer detained for more than a few days.
With the help of Enterprise, and Malcolm surgically altered to resemble a Suliban so as to infiltrate the camp, the Human and Suliban detainees orchestrate a prison break. The Suliban take to space in liberated Suliban ships that were stored at the prison, and make a break for freedom, while Archer and crew head back to Enterprise satisfied that they gave innocence a chance.