The modern-day musketeers try to rescue a kidnapped child who is being used in a mafia blackmail plot.
Aramis joins the muskeeters as their fourth member, as they attempt to protect a mafia informant about to testify.
Ann-Marie's ex-husband Harry enlists her help to get the musketeers to protect him from a hitman, but Harry is not to be trusted.
A gang of thieves calling themselves "The Real Musketeers" frame the musketeers.