Cam is a fifth-grader with a photographic memory who earns her nickname from her ability to take mental pictures of her surroundings. She triggers this memory by saying "click" to store details in her mind. Highly intelligent and curious, she uses her skills to actively observe the world. Her intense focus on mysteries occasionally causes her to overlook basic safety precautions.

Eric is Cam's best friend and the eldest of four children. He is a responsible boy who is highly experienced at taking care of babies, feeding and carrying his younger brother everywhere. His practical mindset and cautious nature complement Cam's bold approach to problem-solving.

A tall man with a curled mustache who causes a major commotion at the shopping mall. He exhibits intimidating behavior and draws the immediate attention of both the police and Cam during the confusion at the jewelry store.

A tall man and woman who quickly leave the scene of the store alarm. Their hurried departure and lack of standard baby supplies attract the suspicion of the watchful children.

Two elderly women who are present inside Parker's Jewelry Store during the robbery. Though frightened by the ordeal, they earnestly try to help the authorities by providing crucial details about the suspect.

Eric's infant brother. He accompanies the older children everywhere and requires regular feeding and care, which adds a layer of practical responsibility to their impromptu investigation.

The owner of Parker's Jewelry Store at the local mall. He is the victim of the sudden diamond robbery that sets the story in motion.

Eric and Howie's mother. She relies on her responsible eldest son to watch the baby while she runs errands in the shopping center.

A member of the local police force called to investigate the commotion. He works to gather information from the confused crowd and struggles to sort out the conflicting eyewitness accounts.