Reticence: The Custard Protocol, Book 4

Percival Tunstell loves that his sister and her best friend are building themselves a family of misfits aboard their airship, the Spotted Custard. Of course, he’d never admit that he belongs among them. He’s always been on the outside – dispassionate, aloof, and hatless. But accidental spies, a trip to Japan, and one smart and beautiful doctor may have him renegotiating his whole philosophy on life. Except hats. He’s done with hats. Thank you very much.