“A fitting finale for a gripping futurist series whose four multifaceted heroes offer a strong anti-war, pro-diversity message.” — Kirkus Reviews

In this third and final adventure in the Above World series, Aluna and Hoku, Kampii from the City of Shifting Tides, Equian Dash, and winged Aviar Calli are determined to stop a war and finally face their most terrifying enemy, Karl Strand. The maniacal ex-scientist is planning to conquer the world with his enormous army of tech-enhanced soldiers . . . unless the four friends can get to him first. A fitting finale for a gripping futurist series whose four multifaceted heroes offer a strong anti-war, pro-diversity message.
—Kirkus Reviews

The Above World series is rare in that it actually improves with each sequel. ... Igniting most of the adventures are the various conflicts the friends face separately, even as their struggles are woven together throughout the novel. ... An entertaining novel that will provide a satisfying conclusion to the series for fans.
—VOYA

In Horizon, we come to the dramatic conclusion that delivers surprise, struggle, betrayal and conflict. Prepare for an edge-of-your-seat finale to the series that has dealt with real-life problems such as trust, prejudice, friendship and above all, being true to yourself.
—Justine Magazine