is "not just for kids", calling it thought-provoking and "a visually, if densely, written tale of sci-fi suspense that ponders big questions with wonderment and heart." Stefan Raets of Tor.com agreed that the novel has "a lot to offer" non-young adult readers, complimenting the engaging characters and calling the setting of E3 "so insanely cool that it just about blows any other steampunk London clean out of the water." He added, "Planesrunner is one of those novels that grabs hold of you from the very beginning and then just never lets go until the very end." Kirkus Reviews praised the novel's "shining imagination, pulsing suspense and sparkling writing", and multiple reviews noted McDonald's successful simplification of the theory of quantum mechanics, which makes the concept easy to understand. Sequels A sequel, Be My Enemy, was released on 4 September 2012, followed by Empress of the Sun on 4 February 2014. Be My Enemy While the Everness crew assess their location and the condition of the airship, Everett tries to figure out how to interface the Infundibulum with Charlotte's jumpgun so he can choose the destination planes of future jumps. Something large appears on the radar, headed their way: a massive hovercraft battleship, with insignia that identifies the Islamic Britain of E2. It is swallowed by a giant creature that breaks through the ice just as the Everness jumps to Everett's home plane, E10. Meanwhile, an alternate Everett in E4—whose father Tejendra was previously hit by a truck on his bicycle and killed—is hit by a car himself. He awakens in a station on the Moon, where an alien machine intelligence known as the Thryn arrived in 1963. Kept secret from the majority of people on Earth for 20 years, the Thryn Sentiency helped mankind achieve important medical and technological advancements, including the creation of the Heisenberg Gate. Plenipotentiary Charles Villiers—Charlotte's E4 counterpart—asks E4 Everett to become an agent for the Plenitude. The Thryn avatar Madam Moon rebuilds Everett's wrecked body with technology that provides enhanced strength, speed, and agility; heightened senses; and built-in weaponry. He goes to E10 Everett's home, impersonates him, and attacks when E10 Everett arrives to rescue his mother and sister. The Everness escapes to the quarantined plane E1, where E10 Everett believes the jumpgun was created. He hopes to learn how to track past jumps in order to find his father. E1 has been overrun by