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Thelma Jean Finkelstein%E2%80%94that would be TJ%E2%80%94has grown a little accustomed to her invisible sidekicks from the 23rd century, Tuna and Herby, who continue to complicate her life as a seventh-grader at Malibu Junior High. In the third installment of the TJ and the Time Stumblers series, TJ must learn to watch her thoughts when Tuna and Herby's attempt to fix their Thought Broadcaster Pen backfires, so that whatever TJ thinks becomes real, which results in some real messes. Myers (profiled onp. 36) spins an inventive, hyperkinetic tale with a moral lesson hiding between the lines. Ages 9%E2%80%9312. (Sept.)