Tegan Oglietti is killed by a sniper at a protest about climate change. She wakes up a hundred years later in a climate changed world. Tegan herself is white and heterosexual, but most, if not all, of the people she interacts with are queer and/or of color. There's also at least one trans person in her circle in 22nd century Australia. The We Need Diverse Books campaign has really had an impact on the whiteness of YA fiction. Sometimes it feels like it's just for show, but I think Healey does a good job of creating realistic characters outside of her lived experience. You can read her feelings on book cover whitewashing on a blog post written in 2010, so she wasn't jumping on the diverse books bandwagon. Her other blog is a LiveJournal with 45 feminism tagged entries. Apparently I'm jumping on the Karen Healey bandwagon!
So...back to the story. Teeg wakes up and is devastated and pissed--as you might feel if one day you'd kissed the boy you liked for the first time, and the next day everyone you know was dead. Luckily her doctor is a mensch and helps her escape the worst miltary officiousness and their assertions that they more or less owned Teeg.
Once she gets out of the army hospital, it's fun to see her learning to adapt to 22nd century tech and slang and begin to make friends with her fellow students at an elite high school. Things she learns about her new era--immigration is not tolerated, the heat has gone way up, expectations of privacy have gone way down, and eating meat is disgusting.
My one complaint about the novel is that it reads like part one, which it is. I've already begun the sequel, While We Run.