Now that he's in second grade, Jim wants to be scary for a change on Halloween. He chooses a truly horrifying mask--only to discover that, in the dark and excitement, he's frightened of his own reflection. As is customary in this popular, reassuring series, his classmates come up with a comforting solution: he'll share Willy's spaghetti-and-meatball costume. Once again Cohen addresses a common childhood fear in a smoothly realistic text that can be easily read by a second grader, with Hoban's cheerful, sympathetic illustrations reinforcing the familiar characterizations. Halloween stories are always welcome; here's a good one.