Sarah Wilson uproots her wife Maggie and teenage son Fraser from their lives in New York City to start a new chapter in Chioggia, Italy; Fraser is uninterested in connecting with the other teenagers on base, until he meets Caitlin.

Caitlin's period accelerates her secret desire to experiment, flirt with girls, test boundaries with her boyfriend, and spar with her father Richard; Fraser discovers Caitlin's secret, which forever changes the nature of their relationship.

When Caitlin and Sam break-up, the group of friends begins to fracture; Colonel Wilson decides to deploy her troops early, and her complex relationship with Fraser is rattled when his crush becomes her only ally.

As his deployment is fast-tracked, Craig proposes to his Italian girlfriend, Valentina; Craig's friends throw a Hawaiian-themed wedding that leads to an evening of debauchery.

As the power struggle between Sarah and Richard escalates, the relationship between their wives continues to grow; Caitlin asks Fraser for help to make a bold statement; Danny questions Jenny about his biological father as he dives deeper into Islam.

Sarah is thrilled to learn about her son's burgeoning friendship with Jonathan; Richard uses a father-daughter hunting trip to get inside Caitlin's head; Sarah receives a phone call that will forever alter life on the base.