Captain Eric Pope and his crew face a challenge like none other aboard their goliath submarine, the U.S.S. Mobius. The weekly run from Portsmouth to Plymouth, England has become routine in the year that they have been in operation. But now, for the first time, there are to be passengers. In addition to the unusual compliment of characters who have boarded the vessel for her inaugural passenger service, a sinister mob of commandos is hidden deep within the cargo hold. Their mission: to seize Mobius, kidnap all aboard and deliver the vessel and its fissionable material to their homeland."