A note from a secret admirer springs a rat from the slough of despond in this deft US debut. It looks like just another day of “bathrobe blues” for lonely, depressed Rat, until he gets a piece of unsigned fan mail: “Dear Rat, this letter is from someone who really admires you. I think you are very special. . . .” Who sent it? Rat cleans up and visits Mouse, who says no. Maybe Frog? But Frog’s laid up with a broken leg. Bat? No—but Bat seems pretty gloomy too. Just getting out and helping his friends so brightens Rat’s outlook, however, that in no time he’s planning a party, and penning a letter to his mopey friend: “Dear Bat, this letter is from someone. . . . ” Beeke tracks Rat’s rising spirits with cartoon illustrations in watery blues that give way to sunny yellows and greens, culminating in a grand picnic that even a now-smiling Bat swoops down to attend. So who did write the original letter? A wink is the only clue. Try this mood-changer on downhearted children; it’s as infectiously uplifting as Mrs. Biddlebox (2002). (Picture book. 6-8)