Twin Suns is science fiction, with a fair amount of humor in it. It is action-adventure but it doesn't take itself too seriously. It has lots of explosions and lots of jokes. It's a bit like a Michael Bay movie, but with well-written dialogue and strict adherence to the laws of physics. It follows the crew of the USS Tranquility as they fight to survive in a hostile solar system. After an eight year journey, they arrive in the Twin Suns solar system to find that the Japanese fleet has taken control of the system. Thanks to the communication lag between Twin Suns and Earth, they were sent before the war even started, and arrive when it's all but over.
The crew is made up of a few soldiers the military actually wanted, juvenile delinquents they planned on essentially selling to a mining company, and a hot redhead who was to be eye-candy (or more) for the admiral in charge of the U.S. fleet in Twin Suns. This unlikely crew, minus the third of them who die during the trip, end up commanded by Christina Monroe (the intended eye-candy) and David Torres (a juvenile delinquent) as they struggle for survival.