Investigations

Investigations are an action by which a member of a House can uncover information, including Secrets, about another House, colony, or faction.

Codex
"Security team members in your house can be assigned to investigate another character, house, colony, or faction. They will use their personal networks of spies and mercenaries to find out as much as they can about the target. Investigating a faction at the edge of your know space, for example, will identify the systems that it contains, its neighbours, and the key individuals in that faction.

Investigating a specific character or house will also increase the likelihood of discovering any secrets that character, or members of that house, are hiding."