Busybody Nora's shy little brother Teddy comes into his own via a series of small, apt coups that add up, unnoted, to a major transformation. At the outset, he's adamant that he doesn't like parties and won't go to classmate Bryan's; but after he and his mother mistakenly barge into a big, hectic one (just, she says, to deliver the present), he comfortingly finds Bryan alone, waiting for him--the other invited guest is sick--and plunges right in. And to Nora's subsequent, ""I told you parties are fun!,"" he replies--rightly--""Sometimes they are, and sometimes they aren't."" Hurwitz, however, is too smart to constantly build up Teddy's confidence, so we have incidental domestic to-dos (the children's two apprehensive days in the care of Grandpa and Grandma; their day of dawn-to-almost-dusk squabbling) before Teddy scores two triumphs over Nora--he finds the perfect, quiet, hairless (mother's allergic) pet, a tortoise, and earns money as a cat-sitter--and then, Nora-like, impulsively, invites his whole class up for juice and cookies when they're on an outing. This, too, is lightly handled as an adventure: the apartment-house elevator gets stuck, one child panics, kindergarten teacher Linda starts a countdown, and Teddy--wait till Nora hears this!--gets to press the red Alarm button. A resonant little addition to a very likable series.