Mission: Theta (Perils of S.P.A.C.E. Book 5)

A sentient virus has infected S.P.A.C.E. Station Helios and is threatening to destroy all of New Earth. S.P.A.C.E. Agents Sundance and Timmy, and their friend Astralyn travel to Helios to get to the bottom of things, only to become trapped aboard and hunted by Theta. They must stay one step ahead of the virus if they ever hope to save New Earth and themselves.