The year is 2172. Climate change and nuclear disasters have rendered much of earth unlivable. Only the lucky ones have escaped to space colonies in the sky. In a war-torn Nigeria, battles are fought using flying, deadly mechs, and soldiers are outfitted with bionic limbs and artificial organs meant to protect them from the harsh, radiation-heavy climate. Across the nation, as the years-long civil war wages on, survival becomes the only way of life. Two sisters, Onyii and Ify, dream of more.

Life is harsh in Chennai's teeming streets, so when runaway sisters Viji and Rukku arrive, their prospects look grim. Very quickly, 11-year-old Viji discovers how vulnerable they are in this uncaring, dangerous world. Fortunately, the girls find shelter - and friendship - on an abandoned bridge. With two homeless boys, Muthi and Arul, the group forms a family of sorts. But when illness strikes, Viji must decide whether to risk seeking help from strangers or to keep holding on to their fragile, hard-fought freedom.

When 12-year-old Maddie hatches a scheme for a secret sleepover with her two best friends, she ends up waking up to a nightmare. She’s alone - left behind in a town that has been mysteriously evacuated and abandoned. With no one to rely on, no power, and no working phone lines or internet access, Maddie slowly learns to survive on her own. Her only companions are a Rottweiler named George and all the books she can read. After a rough start, Maddie learns to trust her own ingenuity and invents clever ways to survive in a place that has been deserted and forgotten.

A world with no hunger, no disease, no war, no misery: Humanity has conquered all those things and has even conquered death. Now Scythes are the only ones who can end life - and they are commanded to do so in order to keep the size of the population under control. Citra and Rowan are chosen to apprentice to a scythe - a role that neither wants. These teens must master the "art" of taking life, knowing that the consequence of failure could mean losing their own.

A secret beats inside Anna Thatcher's chest: An illegal clockwork heart. Anna works cog by cog - donning the moniker Technician - to supply black market medical technology to the sick and injured, against the Commissioner's tyrannical laws. Nathaniel Fremont, the Commissioner's son, sets out to capture the Technician - determined to earn his father's respect. But the more he learns about the outlaw, the more he questions whether his father's elusive affection is worth chasing at all. Their game of cat and mouse takes an abrupt turn when Eliza, a skilled assassin and spy, arrives.