Micro-Key Case

The micro-key case is opened by Tarron during his accusation of Ian, revealing its emptiness as proof of the theft. The Doctor later reconstructs the murder, showing how the relief guard opened the case, lifted the key, and concealed it on his person before the alarm bell sounded. Barbara and Susan assist in the reenactment, grasping the guard's deception as vines threaten outside. The case's role as the container for the stolen key highlights the institutional failure to protect vital artifacts and the personal stakes of the conspiracy.

The micro-key case is opened by Ayden during the murder to extract the key, which he then conceals on his person. The Doctor references the case during the reenactment to show how Ayden could have accessed the key without setting off the alarm immediately. Its empty state is cited by Tarron as evidence against Ian, but the Doctor’s reconstruction reveals it as part of Ayden’s plan to frame him. The case’s role in the scene underscores the precision of the theft and the careful planning involved in the conspiracy.