Emma-Holmes Fox has gained notoriety within law enforcement, having gone against the standards a woman should have at that time period and became a great private detective. She has aided law enforcement many times in trying to capture Thaddeus Winslow Cooper III, her greatest rival, but to no avail. However, when the situation calls for it, the two work together to stop a greater threat.
During the Mission "Off with Her Head!!", Emma-Holmes was sent by the Willington Bros. to investigate the mysterious theme park that was built over their mansion. Sly and Thaddeus had to save her from one of the funhouse's deathtraps before she could be beheaded. Once freed, she gave the Cooper Gang the location of Ven's office in the form of giving the gang the theme park blueprints. With this knowledge, the Cooper Gang would bug Ven's office sometime later. After the defeat of Ven St. Claire, Emma chose to hide in Jabberwock Falls, Wonderland's log flume. She decides to challenge the Cooper Gang to find all of the Clue Bottles and vault treasures. As a reward for doing so, she'll give Bentley a Secret Bentley Mask.