In a future world, six young people discover that UFOs are really time machines sent by future humans who are trying to prevent the invention of the genetically engineered soldiers that have taken over the planet. Original.
A fun penultimate adventure for this middle-grade sci-fi series, and by this point, I'm positive that I never read this far into these books back in the 90s, so I'm excited to see how everything resolves. The six teenage heroes start this volume still stuck in the future dystopia, but they swiftly escape and embark on their mission to somehow rewrite history. The problem is they don't really know how to do that, but they split into pairs to work on the various possibilities, which creates an energetic rush as the plot bounces around among them and allows for some spotlight uses of everyone's special abilities.
One thread sends Ethan and Toni to the 1940s, where the girl's brush with racism is handled pretty tactfully for the intended audience, with the text establishing rude glances and name-calling without actually putting her in danger of violent bigotry or spelling out exactly what she's being called. Back in the present, Jack and Ashley wind up in a paranoid conspiracy thriller that fits well with the story's roots, while Todd and Elena… okay, mostly just research at the library. But at least we finally learn what his power is, and get to see the rippling timequakes that happen from their friends changing things in the past.
It's another quick read, especially with having to balance all those different developments, but it generally manages to juggle everything successfully, answer a few lingering questions, and set up the final installment rather nicely.