After Bea and Thomas McGregor get married and start discussing children, Peter Rabbit begins to believe that the couple might forget the wildlife after they have a baby.
When the McGregors leave the manor for their honeymoon, Peter, frustrated by how everyone sees his rebellious behavior, decides to leave the estate and run away. He drags along his sisters, Flopsy, Mopsy and Cottontail, and friends.
When Peter meets another rabbit who knew his father, his life changes drastically, especially after he agrees to steal produce from a local farmer's market.
Peter has put his loved ones in harm's way. His only hope is that Bea and Thomas can help save them.