: A "darker and edgier" series for teens involving more violence, international espionage, and modern themes like terrorism.

The franchise has evolved through several distinct iterations to keep pace with changing times:

The franchise has also expanded into (notably the 1970s and 2020 versions), video games, and frequent crossovers with their female counterpart, Nancy Drew . Hardy Boys/Characters - Tropedia

: Wholesome, classic adventures often dealing with smugglers, thieves, and local mysteries.

: Their father, a former NYPD detective turned private investigator, who frequently enlists the boys' help on professional cases. Major Book Series Versions