The Alien Debt

Their victory over the Imperial tyranny of United Energy and Transport complete, Bran Tregare and Rissa Kerguelen set out to aid the Shrakken aliens in their war against the telepathic killers called the Tsa. But on route to battle, the Tsa attacked, and Bran and Rissa's scoutship crashed on the wilderness world of Shaarbant. Leaderless, their starship's crew fought the Tsa with an untested, time-twisting stardrive, while Bran, Rissa and their daughter Lisele faced an equally desperate struggle for survival on a perilous and primitive planet.