Axis takes up where Spin leaves off, introducing us to Equatoria, which can be reached through the Arch portal that Tyler Dupree (the narrator of Spin) and Diane Lawton go through toward the end of Spin. Except for one character from Spin who appears briefly in Axis, we’re introduced to a whole new cast of characters who are making their own guesses about who/what the hypotheticals are (if they exist at all) and how to respond to them. At times Axis reads like a good thriller, at times it’s a love story, and at times it’s a fantasy-- and almost all the way through it’s also a compelling, nuanced study in human psychology.
I’m not sure when Vortex, the last book in the trilogy, is due out, but I’ll be looking forward to it. And luckily, in the meanwhile, there’s Brisingr, the last volume in Christopher Paolini’s Inheritance trilogy, to read!