Higgins persuades Magnum to help Garwood Huddle, a member of a notorious group of 1940s bank robbers, whom Higgins feels indebted to after Huddle had once assisted him in a daring MI6 assignment. The man, who has always seen himself as a modern day Robin Hood, has escaped from prison to rescue his kidnapped grandson, but they find that the stash of years-old stolen money that Garwood is to pay the ransom with is gone...