This adventure is the second part of The Apostasy Gambit trilogy, which pits Acolytes against a conspiracy buried deep within the Imperial Church. If you have already played the first part, The Black Sepulcher, the Acolytes should have discovered that the next stage in uncovering this conspiracy is to investigate a very senior churchman, but if you haven't and do not intend to other ways of presenting them with the information that they need are provided. The adventure will take them to some fascinating (and, of course, dangerous) places, and involves both investigation and combat aplenty. They'll need to poke around a cathedral (another cathedral if you've already played The Black Sepulcher!), an underground complex and a spaceship out in the black before everything comes to a climax in a tomb...
The adventure breaks down into three phases. The first seems straightforwards enough, checking up on that senior clergyman by visiting his cathedral, ostensibly to look at relics. This bit is quite free-form, with the Acolytes able to explore the place as they see fit and hopefully gaining the information that they need.
Things then get a bit more hairy, as their investigations lead them to an underhive swarming with rival gangs. Bloodshed will be inevitable as they seek the person they need to speak with, although again this part of the adventure is free-form, letting the Acolytes handle the situation as they see fit as they roam the subterranean setting.
Once they have gleaned the final piece of information that they need, the final part of the adventure involves a space voyage to visit the tomb of a saint... and that's when all hell really breaks loose. The adventure is quite dangerous, so notes are provided on how to work replacement characters into the story at various points.
Throughout, evocative and atmospheric descriptions are provided for the places to be visited and the people to be encountered there, with many individuals receiving detailed write-ups so that you can play them convincingly as they interact with the Acolytes. The vivid richness of it all makes locations and inhabitants really come alive. There are also trouble-shooting notes to help you keep things on track - there's a lot for the Acolytes to find out including several crucial clues along the way that they need to discover to reach the next stage of the adventure, so hints as to how to deal with them missing them are useful! Likewise, events in the underhive culminate in a massive pitched battle and there is good guidance on how to control this and deal with all possible outcomes.
Overall, this is another exciting adventure that should grab your players' imaginations, thrusting their characters deep into the intrigues and violence that hover around the Imperial Church and the work of the Inquisition.