Young Interrogator [[Mita Ashyn]] struggles to prove herself worthy to her master despite her growing feelings of unease at the hypocrisy within the [[Inquisition]]. When they visit the remote and sunless hive-world of [[Equixus]], she suspects nothing more than minor corruption and heresy. [[Night Lords]] [[Space Marine Commander|Commander]] [[Sahaal]] has been in exile for ten thousand years, plotting to defeat his treacherous rival [[Acerbus]] and once again rule over his dark army. To do this he must find an ancient artefact that was stolen from him.