When Sarah Wilson is named the new commander of a difficult military unit in Chioggia, Italy, she uproots her wife Maggie and teenage son Fraser to start a new chapter in this unfamiliar seaside town. Fraser longs for Mark, a friend he left behind in New York, and seems uninterested in connecting with the other teenagers on base – until he meets Caitlin.

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

With his deployment timeline fast-tracked, Craig spontaneously proposes to his Italian girlfriend, Valentina. Determined to ship him off with a celebration he'll never forget, his friends pool their resources for 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, and Sarah fuels the fire by spending time with Caitlin on the base’s virtual shooting range. Later, Caitlin asks Fraser for help making a bold statement, Danny questions Jenny about his biological father as he dives deeper into Islam, and Fraser forms his own connection with Jonathan.

The friend group fractures even further over their hatred for Colonel Wilson, whom they blame for a tragedy that's rocked the base. As Caitlin momentarily pauses her self-discovery journey and Danny fully commits to his, Richard's insubordination reaches a breaking point, forcing Wilson to make a difficult decision.