In contrast to her colleague Esther Drummond, she did not show an interest in learning more about Torchwood following the Miracle Day event. When CIA agents under the command of Brian Friedkin blocked Drummond’s access to agency facilities and attempted to arrest her, Wills' identification and car keys were stolen by Drummond, in order to escape the CIA building where they were based. (TW: Rendition)
Two months later, Wills was forced to step up her efforts to protect the Three Families. Wills informed the Families that the CIA had secretly sent a young agent to spy on Jilly Kitzinger and Oswald Danes, leading to the shooting of the agent and a promotion for Kitzinger. (TW: End of the Road) After agent Rex Matheson was placed in charge of investigating the Families and the Miracle, Wills worked to block him from tracking down the descendents of a witness to a 1928 incident involving Captain Jack Harkness (in TW: Immortal Sins) through genetic analysis of blood left on a murder weapon. Later still, she reported to the Families that Matheson had arrived in Buenos Aires to search for the Blessing and alerted them to Matheson's mobilisation of Argentinian troops, leading to a suicide bombing of the troops. (TW: The Gathering, The Blood Line)
Wills' activities led to the realisation that a traitor was operating at the CIA. Allen Shapiro ordered that the traitor in their headquarters be located with new tracing software. Wills slipped a bomb into her handbag and placed the bag next to Shapiro, wished him and fellow watch analyst Noah Vickers good luck, and stepped out of the room. Willis tricked another analyst into believing that she had been summoned by Shapiro, in order to buy herself a few more seconds to get away. Just as the analyst arrived and the software identified the traitor, the bomb detonated.
Wills was later present at Drummond's funeral, but was found out when Matheson received data recovered from Vickers' work station, showing the software's finding. When Willis saw Matheson running towards her, she pulled a gun and shot him in the chest, before being gunned down herself by nearby CIA agents. (TW: The Blood Line)