The Odette II continues its voyage through the Tau Ceti system. As they near the other side of the sun, their communications are blocked by an unknown source. High-frequency radar shows the jamming's coming from a ghost ship, a Colony Federation vessel that sank over 120 years ago.

The crew of the Bentenmaru and the soldiers of the Serenity Fleet are racing toward the treasure on the ghost ship. But the closer they get to their goal; it becomes obvious the treasure is bigger than imagined.

As the girls register for the Nebula Cup, the other contestants and officials seem on edge. What happened five years ago and who is that person hunting for Marika?