A Gemenese polytheist terrorist group captures and boards the shuttle. They take the passengers hostage. They begin executing them in the names of their gods unless the kids repent of their monotheist beliefs and turn back to polytheism.
Dex, Lacy and Odin Sinclair stop the hijackers from executing more passengers. It is later revealed that this was an STO test to see how strong their monotheist faith is. No one was actually killed. Those deaths were faked and dummies were jettisoned into space. ("Blowback")