The Power of Theater is a central theme in Cue for Treason. Geoffrey Trease explores what theater can offer both audiences and participants, and the broader role it can play through social critique, social movement and mobility, and the dissemination of ideas. The world of the theater is paralleled with the world of conspiracy and espionage, especially through the joint elements of adventure, risk, and disguise.

Trease uses the theater as a plot enabler and as a means to develop his protagonists’ characters. Joining the travelling theatrical troupe expands Peter and Kit’s horizons, presenting opportunity in an otherwise socially rigid society. They learn a new craft, travel, and find community in the troupe, growing their friendship and finding a mentor in Shakespeare, which is formalized as he takes them on as apprentices. Trease shows the power of participating in theater for nurturing individual growth. Both Kit and Peter thrive in different ways, using their different skills: Kit’s acting and appreciation of poetry, and Peter’s mimicry ability (110). They receive support and encouragement, helping them grow.

Trease also shows the power of theater for its audiences, and as such, the broader role that theater and the arts can play in society.