Weaponry is a reoccurring motif in Cue for Treason, embedding the story in its historical context and into the adventure genre by signifying danger. Geoffrey Trease references small weapons such as pistols and daggers that can be easily concealed to reflect the covert nature of the conspiracy and the counter-conspiracy.

Firearms were a frightening and volatile weapon in this period and Trease uses this in his symbolism. Peter is shot at several times, and Trease describes the sound of the crack and the sight of the muzzle flaring, heightening the drama and physical danger of these moments. The pistol was the first weapon with range small enough to be covert until the point of use: The first two political assassinations using guns happened during Elizabeth’s reign (James Stewart in 1570 and William the Silent in 1584), and at least one historical conspiracy against her planned to shoot her. The plotters’ intended assassination using a pistol reflects a genuine fear in this period.

Trease often includes daggers at moments of threat and tension, even when physical violence is unlikely. Kit holds a dagger to Peter’s throat when they first meet, reflecting her desperation.