City of the Sky: Book One Of the Hidden Realm Series

Shesa Ryans has lived her whole life above the clouds- literally. After the flood of 2096, caused by global warming, the city Skyrys was built for the evacuees along the Atlantic coast. Skyrys was meant as a temporary home, but is still used even in Shesa's time, 2210. But even though life in this dystopian floating city seems better than on land, Shesa still can't help wondering what the monstrous clouds mask from her. But when Shesa's older brother, Xander, goes missing, she's convinced that he's been taken below the clouds. Sneaking on a cargo ship, the 15 year-old embarks on a journey with two purposes: find her brother and avoid getting killed while she's at it.

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In case you were wondering, it does say this book is by two authors, which is correct. Me and @Amber_Knight99 collaborated to write this dystopian novel, so part of the credit goes to her.