Diabolik narrowly escapes Inspector Ginko's latest trap, leaving his partner in crime Eva Kant behind. Furious, Eva offers Ginko her help in capturing him, but the former has to face first the return of an old flame of his, noblewoman Altea.
On the night before his retirement, police lieutenant Franco Amore is called to investigate the death of a long-time partner of his in a diamond heist in which he was involved.
