Zero Repeat Forever

Eighth is a Nahx, a mute with no name. His primary duty to protect his Offside. When she is killed, he begins to remember snippets of a former existence. Raven, Tucker and Topher are sent to a remote summer camp after a prank ends badly. Whilst at camp, the Naxh invasion begins and they must survive on their own. They join a community holed up underground in an abandoned military station.
Raven is spared by Eighth early on in the story and when the group leaves the base to seek their families in Calgary, they encounter more Naxh, whose goal is "Dart the humans. Leave them where they fall". Eighth feels a connection to Raven and when she is injured, he helps her recuperate. They forge a way to communicate and Raven names Eighth August when he refers to the eighth moon as the time he was created.
Most post-apocalyptic stories deal with before and after a cataclysmic event or invasion as does this story. Where it excels is in the way August and Raven's friendship develops and how they learn to communicate through August's signs and Raven's words. The Naxh have a Borg-like mentality and as August becomes more disconnected from them, he becomes more human.
The story is written from a dual POV, August's and Raven's. There is a lot of diversity in the characters and the settings of the story. Prendergast's writing style is engaging and the further you read, the more captivated you become with the characters, especially with August. She builds a vision of a post-apocalyptic world that you can visualize through her characters.
This is a great story and I look forward to the sequel.