Getting ready for a two-week business trip, bald-topped Daddy shares his feelings with Abe: ``I miss you so much that my hair falls out.'' Sometimes, too, he says, instead of taking notes in meetings he draws the two of them fishing--just as Abe does, waiting at home. Companionably, both confide the effects of the separation, and then Daddy promises to be home when the crescent moon is full; Abe can watch it, and draw it, larger each day. ``You can always count on the moon, and...on me.'' Comforting, sensible, and crafted with care (it's especially good to find a picture book where the moon isn't full all the time), the story is nicely extended in bright, realistic illustrations where the pajama-clad preschooler--first seen wistfully hiding in the empty suitcase--confirms his closeness to Dad while he helps him pack. (Picture book. 3-7)