"Why was Dad doing this? What could he gain?"

"You know we can build ships as good as the Lhari ships, but we don't know anything about the rare catalyst they use for warp-drive fuel. Captain Steele had hopes of being able to discover where they got it."

"But couldn't they find out where the Lhari ships go for fueling?"

"No. There's no way to trail a Lhari ship," he reminded Bart. "We can follow them inside a star-system, but then they pop into warp-drive, and we don't know where they go when they aren't running betweenourstars.

"We've gathered together what information wedohave, and we know that after a certain number of runs in our part of the galaxy, ships take off in the direction of Antares. There's a ship, due to come in here in about ten days, called theSwiftwing, which is just about due to make the Antares run. Captain Steele had managed to arrange—I don't know how, and I don't want to know how—for a vacancy on that ship, and somehow he got credentials. You see, it's a very good spy system, a network between the stars, but the weak link is this: everything, every message, every man, has to travel back and forth by the Lhari ships themselves."