When Will, a sheep, pushes his presumably older sibling, Olive, out of her chair more times than she can count, Olive decides that Enough is enough! and tells Will that she wants to be alone for a while. How do you know when enough is enough? Will asks, now sitting comfortably on the chair. I just know, says Olive, and she tears a hole in the page (of the book readers are holding), escaping into a green meadow in the next page. When Will follows her--You forgot your book!--she suggests he look at the pictures while she's away, assuring him that she will read to him when she gets back from her alone time. Olive then goes from one page to the next, (literally) enjoying her space and time alone as she floats through outer space, swims with some fish, and walks across a tight rope. When it gets Almost too quiet, Olive misses Will and goes back through the hole in the page, back to the chair in the living room, to read to him. Saltzberg uses simple bold type and cartoonlike images to dramatize an all-too-familiar sibling dynamic that, refreshingly, evolves to a state in which both siblings are equally considerate of the other's wishes. This sweet story will help young readers recognize their own needs--for space, time, and a good book. (Picture book. 3-7)-- "Kirkus Reviews"