So yes, this is part 4 to last weeks story. This is because this is an entire novel. A very brief recap of last weeks episode, so spoilers right now. John drops Liam off at the orphanage, Liam freaks and runs away. Wondering throughout the city. John travels to go see the Prime Minster. However he. He leaves to go meet with one of his informants before himself returning to the SkyHeart. 

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Full book description. 

Liam lived a simple life in the same pattern, hide, get food, protect his sister, stay safe, stay sheltered. That was Liam’s life. However in a single moment, he loses everything that ever mattered to him, so he runs, he runs straight into John Perashing captain of the SkyHeart.

Ninety years ago the world was torn apart. After all that time it has finally begun to be rebuilt in the sky. John, the man responsible for this is terrified of losing what he built. When one of the few precious ground cities is burned down by monsters the world had thought long dead in The Fall, along with the rest of civilization. John is sent into a spiral racing around the world to try and end the bloodshed, and picking up an unexpected passenger along his way. This is the story of the airship SkyHeart.

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Website 

https://www.skyindustry.net/airheart