After their grandfather suffers a heart attack, the three boys are reunited. They make a pledge to their dying grandfather that they will work together to save the family's faltering firm, Granger Aeronautics, which is now in financial trouble. As a result of this, the three of us boys have formed a group to find out who killed their mother and, in the process, release their father, Sheppard, who is serving a 30-year prison sentence for her murder. A fantastic story is made even better by the presence of family secrets, business mismanagement, intrigue, and just a hint of love.