This sequel to The Final Six (2018) raises the stakes for its spacefaring teen astronauts.Naomi Ardalan and the other Final Six are on their journey to colonize Jupiter's moon Europa, leading the way for humans to eventually leave a dying Earth. Naomi is the only one in the group who knows that the leaders of the International Space Training Camp are keeping the truth from them, and it is down to her to discover whether there is alien life on Europa before they land. Back on Earth, and unbeknownst to the crew, left-behind recruit Leo Danieli works with genius doctor Greta Wagner to launch a solo mission to intercept and join Naomi's ship in order to bring them news that not only is there definitely life on Europa, but they are set to land in its most dangerous zone. As the two missions and alternating narratives converge, the unthinkable happens—and everything changes. Fast-paced and plot-driven, the novel decidedly veers into science fiction horror territory with plenty of scares that readers willing to suspend disbelief and embrace the teenagers-in-space setup are likely to enjoy. The syrupy romance between Leo and Naomi continues, and a new layer is added to the story with a frustratingly too-brief examination of colonization and first contact. Naomi is Iranian American, Leo is Italian, and the human cast is international.Breezy, silly, unremarkable fun. (Science fiction horror. 14-17)