"It was a cargo you don't know about," Dagenham said confidentially. "'Nomad' was transporting platinum bullion to Mars Bank. Every so often, banks have to adjust accounts. Normally, enough trade goes on between planets so that accounts can be balanced on paper. The war's disrupted normal trade, and Mars Bank found that Presteign owed them twenty odd million credits without any way of getting the money short of actual delivery. Presteign was delivering the money in bar platinum aboard the 'Nomad.' It was locked in the purser's safe."