Brink Book Three by Dan Abnett
BRIDGET KURTIS IS BACK UNDERCOVER.
Posing as security staff within the paranoid Junot house, she must attempt to infiltrate the Master Sect lurking amongst the upper echelons of Junot corporate before the group realises their plans to appropriate Galina Habitat for mass human sacrifice have been compromised. Separating occult machinations from insider dealing is hard enough, but the board are already suspicious of events on Galina, and the team's top-ranking in could quickly get voted out before they can uncover the truth.
The corporation is viciously secretive, especially where family is concerned, and to earn their trust Kurtis may have to reveal her familiarity with the Sect's arcane gods, whether she wants to or not...