Set in the Warhammer 40,000 Universe, the players take on the roles of Inquisitorial acolytes. On the mining planet Sepheris Secondus, a terrorist group known as the Broken Chains has begun to cause more trouble than the local law enforcement can handle. The attacks of these mutant malcontents have begun to take a very sinister turn, with strange and disturbing technology being utilised. What is really going on on Sepheris Secondus, and can the Inquisition stop the heretical plans that seek to throw the entire sector into chaos?