Comes from an upper-class background, with expertise in firearms and detail-oriented skills, dealing with recent widowhood and finding new purpose.

The group's poison expert and idealist, recruited for her skills and advocacy for justice, navigating a new phase of honesty in her personal life.

An effusive personality with expertise in weaponry and explosives, whose loyalty and emotional vibrancy add depth to the team's dynamic.

A founder of the Museum and former WWII intelligence operative, she is instrumental in training and inspiring the members of Project Sphinx.

Originally a mentor figure, he becomes a contentious presence due to views that clash with Billie's capabilities and approach.

Second-in-command of the Museum’s Acquisitions department, known for his mild-mannered demeanor but with ulterior motives.

A highly skilled agent in foreign languages and intelligence gathering, with a no-nonsense approach and a key role in modernizing the Museum's operations.

A British member of the Museum and an assassin with a past romantic connection to Billie, valuing women as equals.

A young Ukrainian tech expert and Billie’s protege, dedicated and supportive in using her technical skills to assist the team.