Source plot synopsis — includes the ending
Sam and Suzy, both introverted, intelligent, and mature for their age, meet in the summer of 1964 during a church performance of Noye's Fludde and become pen pals. The relationship becomes romantic over the course of their correspondence, and they make a secret pact to reunite and run away together. In September 1965, they execute their plan. Sam escapes from Camp Ivanhoe while Suzy runs away from Summer's End. The pair rendezvous, hike, camp, and fish in the wilderness with the goal of reaching a specific location.
Meanwhile, the Khaki Scouts have become aware of Sam's absence, finding a letter he left behind stating he has resigned. Scout Master Ward tells the Khaki Scouts to use their skills to set up a search party and find Sam. Island Police Captain Duffy Sharp and Ward contact Sam's guardians the Billingsleys, learning they are actually his foster parents and Sam is an orphan with a history of behavioral issues at home.
Eventually, a group of Khaki Scouts confronts Sam and Suzy and tries to capture them. During the resulting altercation, Suzy injures the Scouts' de facto leader Redford with a pair of lefty scissors, and a stray arrow fired by one of the Scouts kills Camp Ivanhoe's dog Snoopy. The Scouts flee, and Sam and Suzy hike to Mile 3.25 Tidal Inlet which they name "Moonrise Kingdom." They set up camp and as the romantic tension between them grows, they dance on the beach and share each other's first kiss.
Suzy's parents, Ward, the Scouts, and Sharp finally find Sam and Suzy in their tent the next morning. Suzy's parents take her home. Ward gives Sam a letter from the Billingsleys stating that they no longer wish to house Sam. He stays with Sharp while they await the arrival of a Social Services worker, who will likely place Sam in an orphanage and possibly treat him with electroshock therapy.
While in their treehouse, the Camp Ivanhoe Scouts have a change of heart and decide to help Suzy and Sam. They help Suzy and Sam sneak out and then together paddle to neighboring St. Jack Wood Island to seek out the help of Ben, an older cousin of the scout Skotak. Ben works at Fort Lebanon, a larger Khaki Scout summer camp on St. Jack Wood Island run by Ward's superior, Commander Pierce. Ben decides to try to take Sam and Suzy to a crabbing boat anchored off the island so that Sam can work as a crewman and avoid Social Services. He performs a wedding ceremony, which he claims is not "legally" binding, before they leave. Sam, Suzy, and Ben set off for the crabbing boat in a sailboat, but quickly return so that Sam can retrieve Suzy's binoculars. As Sam returns to the camp chapel to look for the binoculars, he is confronted by Redford, who alerts the camp to Sam and Suzy's presence. Suzy's parents, Captain Sharp, Social Services, and the Scouts of Fort Lebanon, under the command of Ward, pursue them.
A violent hurricane and flash flood strike, and Sharp apprehends Sam and Suzy on the steeple of the church in which they first met. Lightning destroys the steeple, but Sharp saves them. During the storm, he decides to become Sam's legal guardian. The hurricane erases Mile 3.25 Tidal Inlet from the map. At Summer's End, Sam is upstairs painting a landscape of Moonrise Kingdom. Suzy and her brothers are called to dinner, while Sam slips out of the window to join Sharp in his patrol car, telling Suzy he will see her the following day.
Sources and content license
Source and revision history ↗ · Adapted from Wikipedia contributors, Moonrise Kingdom. Section headings and formatting adjusted. · Content license