An unexpected message from a hospitalized acquaintance brings together a group of unlikely heroes.

Jack O’Reilly, an ex-boxer, and survivor of the Great War where he served in the French Foreign Legion.

Ellie Carlisle, a wealthy dilettante and flapper with more interest in next week’s party than in exploring things best left unexplored.

JD Button, a professor of linguistics and frequenter of speakeasies.

Helen Hardcastle, MD, a no-nonsense doctor who served unflinchingly in the Great War.