Unhappy Appy

Ms. Brumby tapped her shoe in class. "Guess we have an odd number." I knew who the odd number was. We all did. Winnie Willis has always considered horses her best friends. But lately the world seems to be pairing off, and she''s the only one left out. After all, her sister, Lizzy, now has a "best friend"; and Madeline, her dad''s inventor "friend," keeps showing up. But Hawk, Winnie''s only hope for a friend, has been acting as strange as her horse. What''s wrong with Hawk and Towaco? If Winnie wants a chance for a "best friend," she has to untangle the mystery.