A middle child muddles through one minor mishap after another in this Canadian author’s lightweight, low-key debut for young readers. Caught between the reckless schemes of older brother Andy, who’s forever promoting such harebrained ideas as taking a shortcut across a railway bridge, and the challenges of having a little sibling, Leonard, who is already smart enough to cozen both older brothers out of all of their Halloween loot—and to stay off that bridge—Owen’s life isn’t so much “secret” as subject to sudden complications. Though Cumyn draws his incidents, by and large, from the standard chapter-book menu—the battle with bullies, the wildly misinformed conversation about sex, the supporting cast of inept male adults, etc.—he does subject his preteen Everylad to moments of high triumph and terror. He closes with a poignant, ice-breaking encounter between Owen and classmate Sylvia, on whom he’s had a longstanding crush, on the very day she and her parents pack up to move away. It’s not exactly venturesome writing, but Hurwitz fans and other readers who prefer to stay in familiar territory will enjoy following the ups and down of this closely knit trio of siblings. (Fiction. 10-12)