From the introduction: The Mines of Selka is designed for four to ten characters aboard the Albert, a 14,360 metric-ton exploratory/investigation vessel. This scenario is intended to be played by crew members of Federation Star Fleet personnel, although it may also employ Andorians or other alternatives. The adventure follows the activities of a team of Star Fleet operatives assigned to investigate the disappearance of Federation merchant vessels as well as some pleasure-craft and neutral shipping in a region of space not far from the Orion homeworlds.