Tina Badam is the sister of Yona Badam, a British Intelligence Service agent who died during a high-priority investigation. Following her brother's death, Tina inherits a critical item he entrusted to her: a large diamond called the Pharaoh. Yona warned her the diamond must be disposed of swiftly to avert catastrophic consequences, specifically stating "the world will be destroyed by fire" if the "Pharaoh becomes a star." Tina understands this refers to a doomsday weapon using the diamond as a lens in an optical device, focusing sunlight to create a devastating global fire.

Her possession of the Pharaoh and knowledge of its significance makes Tina a target. Fearing harm from her pursuers, she seeks help in distress, revealing the diamond and her brother's warnings to Cleopatra and her group. Tina later uncovers more context about her brother's work, learning of his British Intelligence Service connection and the nature of his investigation, though full assignment details remain partially unclear.

Tina identifies Doctor Randall and the Sleider Group as collaborators planning a horrific scheme with the diamond. She confirms her brother knew their secret, linking the Pharaoh directly to the weaponization plot. This knowledge maintains her peril but also drives her to assist in stopping the conspiracy.

After the case concludes, Tina visits her brother's grave alone, tearfully declaring the investigation he initiated is finished by the "very wonderful people" she encountered and confessing her loneliness. Cleopatra and the group arrive, dispelling Tina's isolation. She runs toward Cleopatra, embracing her newfound sense of belonging and support.