After the sea levels rise and the world ends, Martha and other survivors are stuck on a giant killer jellyfish, drifting off shore--if boredom does not kill them, maybe their escape attempts will.
You get over the fear of death and the smell of fish; boredom is an issue, sure, but it's not the main one. The biggest problem with being trapped on a jellyfish is not being able to get away from everyone. Martha and everyone else living there don't know how they got there or how long they've been there or where they're going. They can't escape-- but they're going to try. Or die trying. -- adapted from jacket