Helen is a wealthy young woman whose life is strictly monitored by her powerful family. She harbors a deep resentment over her lack of financial autonomy and the lingering trauma of her mother's mysterious death three decades ago. Seeking independence, she orchestrates a bold extortion plan during the family's annual vacation to Capri.

Lorna works as an executive assistant for Marcus Lingate, organizing the family's luxurious vacations while harboring her own hidden agenda. Having a complicated past in the Los Angeles party scene, she is a pragmatic planner who desperately seeks financial security. She partners with Helen in a dangerous scheme to extract money from the Lingates.

Sarah was an ambitious, Pulitzer Prize-nominated playwright whose creative talent clashed with her husband's need for control. She died during a family vacation to Capri thirty years ago under highly suspicious circumstances. Her unresolved death and a recently discovered manuscript of her unpublished play cast a long shadow over the surviving family members.

Marcus is the cold patriarch who acts as the primary protector of the Lingate family's public image. He approaches every crisis as a logistical issue to manage through influence and wealth. Confident and authoritative, he expects absolute loyalty from everyone in his orbit.

Richard is Sarah's widower and the weaker, more paranoid of the two Lingate brothers. He cultivates a public persona as a spiritual guru, hiding a deep-seated insecurity and a history of professional jealousy. He tightly controls his daughter's finances while relying on his brother to maintain the family's status.

Naomi is Marcus's volatile wife, a woman whose life revolves around maintaining her marriage and social position. She frequently self-medicates with alcohol and pills to cope with the stress of the family's annual return to the site of their greatest scandal. Highly observant beneath her inebriated exterior, she fiercely defends her territory against perceived threats.

Freddy is Helen's current boyfriend, accompanying her on the tense family vacation to Italy. He appears to be a typical wealthy young man enjoying the perks of the Lingate lifestyle, but he privately conceals a prior connection to Lorna from his days in the Los Angeles party scene.

Ciro is a local Caprese man and the son of the Lingate villa's caretaker. Having grown up alongside Helen during her family's annual summer visits, he knows the treacherous waters and hidden inlets of the Amalfi Coast intimately.

Stan is a billionaire rival to the Lingate family who ostentatiously displays his wealth through private chefs and helicopters. He holds a long-standing grudge against the Lingates regarding Sarah's death and actively seeks information to expose their secrets.

Renata is the long-time caretaker of the Lingate family's villa on Capri. She observes the family's toxic dynamics from the periphery and understands the danger they pose to outsiders.

Bud is the Lingate family lawyer. He protects their assets and insulates them from legal consequences, prioritizing the family patriarchs' instructions over ethical concerns.