Dane signed on with the independent cargo ship Solar Queen looking for a career in off-world trade. In Sargasso of Space, the Solar Queen free-traders win exclusive rights to trade with the planet Limbo, but the crew arrives to find most of its surface charred, with little sign of life. They find a valley with life, but others may still lurk. Worse yet, a strange force threatens to cripple the Queen. They must solve the planet's mysteries if they hope to escape with not only tradeable goods, but their lives.