All Mouse wants to do is eat gingersnaps, lie in the sun, and enjoy her ship in a bottle. All Cat wants to do is eat Mouse. This is a problem.

So one day, Mouse sets off in her ship in a bottle in search of a new home. But the great big world is a scary place for one small mouse. As she sails downriver, she faces grabby seagulls, selfish rabbits, and stormy waters before finally finding refuge in a park on the shores of an enormous city, where she is welcomed by friends of all shapes and sizes. Readers will cheer Mouse's quiet perseverance on her epic journey as she seeks a tiny spot to call her own.