When famed bank robber Lewis Avery Filer, whom McGarrett put away a year and a half ago, learns that a fellow con about to be released plans to resume his career as a drug dealer, he decides to get out on his own and infiltrate the drug gang. Filer plans to tail the drug dealer and relieve him of the $4 million he's received for cocaine shipments, through use of trickery and gadgetry. McGarrett tries to outwit Filer once again and recover the money before Filer can flee with it.