My best friend

"Meet Mouse! Mouse lives in the tree with his best friend . . . Giant Owl. They used to do the most fun stuff imaginable! They'd play chase and Giant Owl would nearly catch Mouse, but not quite. Giant Owl loved Mouse so much that she used to give him as many doughnuts as he wanted and the most amazing presents, including his own house (a cage)! But then one day something happened, and now Mouse has found himself stuck in a very dark place . . . will his best friend help come to his rescue?"--OCLC.