A dilemma in the Nebula! Two spaceships meet in deep space. How do they establish trust, not only between their two crews, but also between their home worlds? A classic puzzle. The only way to warn home would be to return, and how do you know you were not being followed? Trade would be desirable, but how can you base an exchange of knowledge on unfounded trust? What then is the solution to this stalemate of technological equals, other than to utterly destroy the alien ship, who's defensive capabilities are unknown? Download and start listening now!