A quiet, book-loving fourteen-year-old who teams up with her brother Dan to follow mysterious clues left by their late grandmother, using her deep knowledge of history and culture.

The deceased matriarch of the Cahill family, who sparks the plot by bequeathing her descendants a challenge to discover 39 clues, without explaining the risks involved.

Grace Cahill's trusted lawyer and executor of her estate, tasked with conveying her final wishes and overseeing the family competition.

A young, unconventional au pair with a distinctive appearance and language skills who becomes a crucial companion for Amy and Dan on their journey.

A selfish and inattentive guardian who grudgingly oversees Amy and Dan's care, showing little interest in their well-being.

An aggressive, military-like family unit competing in the treasure hunt, known for their physical prowess and intimidating presence.

Rich and cunning siblings who pose a significant threat to Amy and Dan, leveraging their wealth and influence to gain an advantage in the quest.

Ivy-League educated triplets characterized by their elitist demeanor, who become rivals to Amy and Dan in the hunt for the clues.

Led by Jonah Wizard, a reality TV star who, despite his wealth and fame, enters the treasure hunt with self-serving intentions.

A colorful and clever Cahill family member who ventures alone in the treasure quest, displaying a flair for manipulation.

A former KGB spy with a history in espionage, armed with hidden poison darts, who brings her ruthless tactic to the family's competitive challenge.