The Spanish Tragedy centers on the relentless pursuit of vengeance by Hieronimo, a grieving father who seeks justice for the murder of his son, Horatio. Driven by profound loss and the corruption of the Spanish court, Hieronimo navigates a web of political intrigue and personal betrayal. The narrative unfolds through a series of calculated maneuvers, culminating in a play-within-a-play that serves as the mechanism for his final retribution. The world is defined by rigid social hierarchies and the moral decay of the nobility, forcing the protagonist to operate within the shadows of the law. The play utilizes a revenge-tragedy framework, incorporating supernatural elements and soliloquies to externalize the protagonist's internal psychological state.

Readers and critics frequently identify this work as the foundational text for the Elizabethan revenge tragedy genre. Discussion often centers on the intricate balance between Hieronimo's public duty and his private obsession with retribution. Scholars highlight the play's influence on later works, particularly its structural impact on the development of the tragic hero. The atmosphere is noted for its dark, claustrophobic intensity, which effectively mirrors the moral instability of the characters. Readers often examine how the play's violent conclusion serves as a commentary on the limitations of justice in a fractured society.