June is the formidable general manager of the Avallon luxury hotel in the mountains of West Virginia. Known affectionately as "Hoss" by her staff, she coordinates the daily operations of a massive workforce while maintaining the hotel's legendary standards. She possesses a unique connection to the property's natural mineral spring, using her intuition to manage the sudden arrival of Axis diplomats.

Tucker is an FBI Special Agent on a probationary assignment to oversee the requisitioned Avallon. He approaches his duties with rigid bureaucracy and maintains a strict focus on surveillance. His assignment forces him into proximity with a West Virginian environment he actively avoids, leading to friction with the hotel's established culture.

Edgar is the heir to the Avallon who assumes ownership following the death of his father. He views the property primarily as an asset and makes unilateral decisions about its use to serve his own interests, specifically avoiding military service. He maintains an ongoing, complicated attachment to the hotel's general manager.

Sandy is Edgar's younger brother who recently returned from military service. Following a training accident, he uses a wheelchair and presents with severe psychological unresponsiveness. His condition requires constant care and casts a somber shadow over his family's legacy.

Benjamin is a representative from the US State Department tasked with managing the diplomatic internment at the Avallon. He coordinates the logistical nightmare of housing enemy nationals while attempting to secure the reciprocal safety of Americans held overseas. His bureaucratic exterior masks deep personal grief from his private life.

Hannelore is the ten-year-old, non-verbal daughter of a German cultural attaché. She relies on keen observation and sensory input to interpret the chaotic adult world around her. Her presence at the hotel introduces unexpected emotional stakes for the staff tasked with serving the internment operation.

Lothar is a Gestapo agent embedded within the German legation. He polices the interned diplomats with cold-blooded pragmatism, acting as an enforcer of his government's strict ideological standards while housed at the hotel.

Otto is a Nazi Party physician interned at the Avallon. He openly advocates for his government's eugenics programs and views vulnerable individuals entirely through the lens of strict, clinical utility.

Sabine is the wife of a German cultural attaché interned at the Avallon. She presents a controlled, elegant exterior that fits her diplomatic status, but privately harbors intense anxiety regarding her daughter's safety under their government's strict ideological standards.

Griff is the Avallon's staff captain who oversees the extensive back-of-house operations. He acts as a steadfast, highly competent deputy to the general manager, ensuring the hotel's complex machinery runs smoothly despite the sudden shift in clientele.

Toad is the formidable head of housekeeping at the Avallon. She manages her department with pragmatic efficiency and fierce loyalty. Her professional duties require her to serve enemy diplomats despite suffering a devastating personal loss during the attack on Pearl Harbor.

411 is a reclusive designer who has lived in a specific suite at the Avallon for decades. She refuses to evacuate when the government commandeers the building, securing a superficial consulting position to bypass federal rules. She observes the hotel's shifting dynamics from a theatrical distance.

Sebastian is the Avallon's exemplary head waiter. He executes his service duties with grace, compassion, and an optimistic professionalism. His natural kindness places him in a precarious position when interacting with the desperate individuals detained at the hotel.

Maurice is a gloomy but brilliant French expatriate who runs the Avallon's kitchens. The government mandate forces him to prepare exquisite meals for officials representing the same forces occupying his home country, causing immense psychological strain.

Francis is the recently deceased patriarch of the Gilfoyle family and former owner of the Avallon. His sudden death leaves the hotel's future in the hands of his unprepared heirs.

Friedrich is a German cultural attaché transferred to the Avallon for internment. He attempts to manage his family's precarious political standing while under the direct scrutiny of his own government's enforcement agents.

Hugh is an FBI agent assigned to the Avallon detail. He assists in surveillance operations and manages logistical challenges, including dealing with the racial prejudices of the hotel's local staff.

Pony is an FBI agent working on the internment detail. He manages communications and security tasks under federal direction.

Stella is the sister of Edgar and Sandy Gilfoyle. She arrives at the hotel to assist her traumatized younger brother during the government occupation.

Erich is a famous German pilot interned at the hotel. He worries for his fiancée who remains unaware of his sudden relocation.

Hertha is the fiancée of Erich von Limburg-Stirum who eventually joins the internment camp under border patrol escort, participating in a brief marriage ceremony shortly after arrival.

Ulcie is the switchboard supervisor at the Avallon whose prejudices create operational friction for the FBI agents attempting to monitor the hotel's communications.

Sachiko is the wife of the Japanese consul. She relies on the general manager's discretion to survive the financial humiliation of frozen bank accounts during their internment.

Jillian is the daughter of the State Department representative. She corresponds through letters that frame the historical account of the hotel's wartime years.

Eric is a representative of the US State Department who communicates through framing letters regarding the historical events at the Avallon.