One experiment. Four Units. 20,000 individuals. Wren can remember everything that has ever happened in her short, seventeen years of life. She lives with 5,000 other tenants in Unit IV. They drill. Every day. They don't need food, or water, or sleep. They just are. But what is the experiment for? Why drill so many in war combat for no reason? Join Wren as she discovers the dark secrets that seemingly innocent USA is harboring. And the flaw in the plan...

"Give me ten days, and I can give you ten reasons not to die." Evan paused. "And if I can't change your mind by then, you can go jump off that cliff."

Is it possible to consider someone your only friend and never know their name? This is the peculiar situation Penelope Elkins finds herself in when she becomes friends with a stranger in her apartment building. She becomes increasingly close to them without ever asking for their name then suddenly they disappear and she must go on a treacherous and horrifying adventure to save them.