Captured by a ruthless gang of criminals, master thief Diabolik (Giacomo Gianniotti) and Inspector Ginko find themselves face to face, locked in a cell with no way out. Certain of facing an inevitable death, Diabolik reveals his mysterious origin story. Meanwhile, Eva Kant (Miriam Leone) and Altea (Monica Bellucci) are desperately looking for them. Will the paths of the two rivals cross again?