Plot
At John F. Kennedy International Airport, Benji Kaplan waits for his once-close cousin, David, to arrive so they can board their flight. Using the funds left by their late grandmother, the Kaplans plan a Jewish heritage tour through Poland in hopes of seeing the home she grew up in and connecting with their family history. Their contrasting personalities spark several arguments: Benji is a free-spirited and outspoken drifter who criticizes David for losing his former passion and spontaneity, while David is a pragmatic and reserved family man who struggles with Benji's unfiltered outbursts and lack of direction in life.
Arriving at Warsaw, David and Benji meet with their tour group members: Mark and Diane, a retired married couple from Shaker Heights, Ohio; Marcia, a recent divorcee from California; and Eloge, a survivor of the Rwandan genocide who converted to Judaism after moving to Winnipeg. The tour is led by James, a mild-mannered, knowledgeable, gentile guide from Yorkshire. On the first day, the tour visits the Monument to the Ghetto Heroes, Grzybów Square, and the Warsaw Uprising Monument. Benji engages the whole group in assisting him in a reenactment of the Warsaw Uprising around the latter sculpture. An embarrassed David stands apart and takes pictures using the members' phones. In the evening, the two of them smoke marijuana on the rooftop of their hotel.
The group travels to Lublin by train on the second day. Benji is unsettled by the incongruity of traveling first class on a Holocaust tour through former Nazi German-occupied Poland. David falls asleep and Benji does not wake him, which results in the cousins missing their stop. After finding their way back, James leads the group through the city's cultural sights, such as the Grodzka Gate and the Old Jewish Cemetery. Benji criticizes James's lack of authenticity during their visit to the cemetery and challenges his focus on facts and statistics. Benji continues to misbehave and make uncomfortable comments during a group dinner later that evening. When he leaves the table, David opens up to the group about the complex nature of their relationship, revealing that the two have drifted apart after Benji attempted suicide by overdosing on sleeping pills six months earlier.
The next day, David and Benji visit Majdanek, a Nazi German concentration and extermination camp, during their last day with the group. They see the gas chamber, the crematorium ovens and a huge pile of the victims' shoes. Deeply affected by what they had just witnessed, the group sits in stunned silence as their van returns to Lublin, with Benji, seated next to David, sobbing. Back at the hotel, the group members bid farewell to each other. James tells Benji that he is the first person on one of his tours to provide him with honest feedback, and thanks him for changing his perspective, although Benji does not seem to remember the outburst. The Kaplans smoke marijuana together on a hotel rooftop on their final night in Poland. Benji confronts David about his changed personality and asks why he never visits him. While David initially responds that he is busy with his wife and son, he eventually breaks down and explains that following Benji's suicide attempt, he is unable to bear the thought of a person with Benji's talent, charm and passion for life killing himself.
In the morning, the cousins travel to their grandmother's former home in Krasnystaw. Benji recalls a moment when she slapped him after he arrived late and intoxicated to dinner, which gave him a sense of clarity and humility. He laments that she was the only person who was able to keep him disciplined. David suggests that they place visitation stones on the home as an act of remembrance, but a neighbor asks them to remove the stones because they are a tripping hazard. The pair flies back to New York and exchanges goodbyes. David invites Benji to his home for dinner and offers to give him a ride, but Benji declines the offer, prompting David to slap him. They immediately reconcile and profess that they care deeply about each other. David returns home to his wife and son, leaving a visitation stone on his doorstep, while Benji returns to his seat at the airport, observing travelers with tears in his eyes.