There is a Tide

First printed in Galaxy, June 1968. The reprinted in the collections A Hole in Space 1974, Tales of Known Space 1975 and Three Books of Known Space 1996.

Louis Wu, on sabbatical in deep space until he can stand the sight of another human face again, detects a slaver stasis box, the biggest ever found. But another ship is homing in on his target, and Louis finds himself gambling with the Trinocs for his prize... and his life!