An alien protomolocule has taken root on Venus. Earth and Mars are in a shooting match over an incident on Ganymede. The Solar system is moving towards all-out anarchy and war, and it falls to a well-meaning meddler, a canny politician, a Martian marine and a grief-stricken botanist to try to stop the descent into madness. Caliban's War is the second novel in The Expanse series, following on from last year's well-received Leviathan Wakes . This is old-school space opera, featuring the crew of a spacecraft as they attempt to save the Solar system from an alien menace. The series features some nods towards serious science - the ships work strictly by Newtonian physics and there is no FTL travel, with the scope of events being limited (so far) to the Solar system alone - but it's certainly not hard SF. The emphasis is being on an entertaining, fast-paced read, and the book pulls this off with aplomb. The cast of characters has been expanded in this volume, with only Holden r...