Books like The Book of Lost Things

Max Starling's theatrical father likes to say that at twelve a boy is independent. He also likes to boast (about his acting skills, his wife's acting skills, a fortune only his family knows is metaphorical), but more than anything he likes to have adventures. Max Starling's equally theatrical mother is not a boaster but she enjoys a good adventure as much as her husband. When these two disappear, what can sort-of-theatrical Max and his not-at-all theatrical grandmother do? They have to wait to find out something, anything, and to worry, and, in Max's case, to figure out how to earn a living at the same time as he maintains his independence. This is the first of three books, all featuring the mysterious Mister Max.