02 - Space-Liner X-87 by Ray Cummings

The X-87 was a chaotic marvel, hurtling through the cosmos with a renegade Venusian at the helm and a daring Martian charting its course. But beneath the ships metallic surface, locked away in an alumite cage, lies Penelle, the skilled Shadow Squadman—grasping the future of three worlds in his shackled hands. - Summary by Original Gutenberg text