Marcus Vega has been described as the "Mastodon of Montgomery Middle School" for his enormous weight and height. Yet he prides himself on his role as paid bodyguard against bullies and enforcer of school policy on littering and cell phone use, reminiscent of Chris Rylander's The Fourth Stall series. Even though he carries on with these money-making schemes, Marcus is secretly a good guy, school helper, reader and library supporter, and a good brother to Charlie, who has Down syndrome. Marcus often assumes the role of parent and shares some of his most endearing moments with Charlie. Sadly, Marcus' ability to move heavy school stuff and contribute his hard-earned money to the family cookie jar is taken for granted. When Marcus is involved in a fight defending his brother from slurs about physical/mental disabilities, the school principal threatens to expel Marcus. Since Marcus' mom works for an airline, why not lie low and visit his family in Puerto Rico? Locating Marcus' long-since-disappeared dad is not high on his mom's agenda, but she realizes the quest must proceed. Although the long-awaited reunion does not go as planned, Marcus uncovers a bitter truth and finds a new family that rallies behind him. Surprisingly, Marcus' new-found friends (former clients) at school set up a petition to prevent Marcus' expulsion. An ideal read for middle schoolers and reluctant readers.