A secure investigation platform in a sovereign cloud includes a request processing system that is a user-facing system and receives requests to prepare for an incident investigation. A control message processing system creates a workspace, within the sovereign cloud, so that an investigation can be conducted within that workspace. The request processing system does not access the workspace and the control message processing system is not available for external access by a user. Data and functionality are ingested into the workspace. The control message processing system performs investigation preparation tasks within the workspace. The results of the investigation tasks are surfaced for user access.