Interstellar soccer athlete Albert Kinney heads for a climactic match, with both his peace of mind and a win for a conquered planet on the line.Past triumphs notwithstanding, the odds are still stacked against the team from occupied planet Zeeno and its seventh grade human Star Striker, who's headed to the johka tournament finals. In one match, players can be dumped into a subterranean river filled with poisonous eels through holes that open at random on the pitch. Another is played in darkness against the cheating, murderous Tevs. Meanwhile, Albert's unusually clever canine buddy, Tackle, is turning evil genius Mehklen into an ally as a prelude to freeing thousands of Zeenod prisoners to throw off their Tev oppressors. Fun as all this action is, though, the series has from the outset been less about heroic exploits and more focused on Albert's efforts to overcome his "shawbles," or character flaws, and cultivate positive energy. Not that there aren't plenty of the former, but the program of mental exercises, thought experiments, and meditations provided by Albert's Zeenod mentor, Ennjy, fills the spaces in between, adding a strong instructional bent to exchanges and events. Both the matches and girlfriend problems back on Earth give Albert opportunities galore to apply his hard-won insights, but when right thinking leads to right actions, can right results be far behind?A well-rounded, satisfying trilogy closer sure to please fans. (Science fiction. 9-12)