Dark Sky's Ashes: Casey Grimes #3.5

Let sleeping dragons lie.

When Conley leaves his safety-obsessed neighborhood and moves to the historic Kansas City Dragon District, he hopes for adventures and new friends. Instead he gets an ancient house with a secret that might roast him alive. So long, summer break.

Dark Sky's Ashes is a rip-roaring middle grade fantasy about a family ambushed by their city's dragonish past. It's a standalone that also acts as book 3.5 in the Casey Grimes series.