☆Stopping Balthazar Bratt, a former child star turned supervillain, who has stolen the Dumont Diamond. Later, he teams up with his long-lost twin brother, Dru, for one last criminal heist. This heist involves stealing the Dumont Diamond once again, after Bratt steals it from Gru and Lucy.
The Dumont Diamond is the central plot device. Bratt initially steals it from Gru and Lucy, and they later try to retrieve it, with Gru and Dru eventually succeeding in the heist.☆

☆and you and Dru are now with Gru and his wife Lucy to get the Dimond back☆