In the far future, a spaceship built on earth travels through distant reaches of our galaxy building a serious of wormhole gates for the hypothetical use of humans who will come after them. Except the ship as been traveling for hundreds of thousands of years and no one has ever come out through the gates. The lives of the 30,000 humans on board are artificially extended because they spend the majority of their time cryogenicly frozen, with only brief times spent awake to help out when the ship runs into a problem that the onboard AI can't handle. The ship is also riddled with strange little mysteries: a hidden valley of data crystals; gardens of mutant modified plants; graffiti on the walls in which people leave messages for others who might not wake up and see them for hundreds of years. Amidst all of this, some of the ship's crew want to rebel, tired of their endless missions. But how can they rise up when they spent nearly all their time asleep? I loved the premise of this novellla, and enjoyed the ship setting, but found the character development rather thin. If I had really loved any of the characters the twist at the end would have hit a lot harder.