The Sisterhood of the Traveling Pants 2

Childhood friends Bridget Vreeland, Lena Kaligaris, Tibby Rollins, and Carmen Lowell have completed their first year of college and will spend their summers apart.
Bridget finds letters from her grandmother Greta her father had hidden, but does not accept it was to protect her. She goes to Turkey for an archaeological dig but after reading her grandmother's letters, Bridget leaves to visit her in Alabama. She learns her mother, who committed suicide, had denied having depression or any mental issues.
Not allowing anyone into her life who challenged this or got her help, Bridget's father tolerated it but Greta could not, so she moved away as her daughter refused help. Greta assures Bridget that her suicide was not her father's fault, observing she is 'stronger' than her. Bridget later returns home and reconciles with her father.
While mourning her grandfather Bapi's death in Greece, Lena meets her ex-boyfriend Kostas. He reveals he is married and expecting a baby with his wife. She returns to the RISD and begins dating her life class model, Leo.
Kostas visits her, revealing that his marriage was annulled after his wife admitted she was not actually pregnant. Lena forgives him but refuses to take him back, saying they have changed. However, after spending time with Leo, she realizes they are incompatible.
Tibby works at a video store in NYC while retaking a screenwriting class at NYU that requires her to finish her script. While losing her virginity to her boyfriend Brian, the condom breaks. Fearing she might be pregnant, Tibby withdraws emotionally. She breaks up with Brian and reluctantly gives Lena's younger sister Effie permission to date him.
Lena brings Tibby a requested pregnancy test, but she gets her period before needing it. Tibby drives to Vermont, hoping for Carmen's support, but leaves after they argue over who ignores whom more. She goes to Brian's and apologizes, confessing she had been afraid of dealing with change. Realizing he still loves Tibby, he breaks up with Effie.
Carmen attends an actor workshop in Vermont, prompted by fellow Yale student Julia. During auditions for The Winter's Tale, Ian, an actor, encourages Carmen to try out. She ultimately wins the lead, Perdita, causing Julia to become envious. Carmen grows more confident when her talent is seen by the director Bill and the other actors, including Ian, with whom she begins a flirtatious friendship.
One night, Julia says she has a date with Ian, upsetting Carmen and causing her to falter in rehearsals. When her mother Christina goes into labor early, she reconciles with Tibby and asks her to help. Ian comforts Carmen, revealing he only had dinner with Julia because she begged.
Carmen overhears Julia trying to undermine her to Bill, who refuses to replace her. Regaining her confidence, she performs successfully, and kisses Ian after the play. While packing to leave, she chastises Julia.
Effie, upset with Brian and Lena, steals the pants and loses them in Greece while visiting their grandmother. Bridget, Lena, Tibby, and Carmen disagree that the pants are worth saving, so Lena travels to Greece to look for them. Discovering from Effie that Lena refused to take Kostas back when he visited her in Rhode Island, the other three follow her to help search for the pants and convince Lena to give Kostas another chance.
Lena sees Kostas, who reveals he will be doing a master's degree at the London School of Economics, but they part. Later, Lena looks for Kostas on his boat and they kiss. Although they do not find the pants, the summer ends in Greece with the four friends renewing their mutual commitment to each other.