Mouse and Mongoose is about an odd-couple friendship and their adventures in Hawaii. Mouse and Mongoose are best friends. One day, Mongoose visits Mous and tells him he has never seen a rainbow.l Ready for a day of fun, Mouse agrees to help him find one. They look under rocks. At the tops of trees. On a mountain. Down at the each. But they cannot find a rainbow. Mouse enjoys everything they see and do. Mongoose, however, gets grumpier and grumpier. In the end, Mouse tries to show Mongoose a different way of thinking. Although Mongoose will never change, he realizes the importance of sharing a beautiful Hawaiian day—even a grumpy one—with a friend.