Fans who feared John Varley was evolving into another Robert A. Heinlein imitator may have mixed reactions to Red Thunder. Debuting in 1974, Varley became the freshest, most exciting and most important new science-fiction author of the 1970s. He dominated the decade with numerous stories and two novels, set mostly in his Eight Worlds future history. By 1984 he had won three Hugo Awards and two Nebula Awards. Yet his output dwindled through the 1980s and in the 1990s he released only two novels, Steel Beach and The Golden Globe, a pair of Eight Worlds books that received tepid responses.

Part of SF's turn-of-the-century trend towards "Mars novels," but not part of Varley's Eight Worlds series, Red Thunder reads a lot like a Heinlein juvenile novel—if Heinlein were alive and writing juveniles in 2003. Varley's paying tribute to the master's juveniles, especially Rocket Ship Galileo and Red Planet (and also, more subtly, to the ending of Alfred Bester's novel The Stars My Destination). Though Varley is working with decades-old tropes and is not in his full wildly-imaginative 1970s mode, Red Thunder is an enjoyable SF novel that should win back many disgruntled fans and gain him a new generation of admirers. —Cynthia Ward, Amazon.com