Peter Swanson’s novel Every Vow You Break explores the fragility of identity by depicting characters who adopt calculated personas and perform prescribed roles. Through this focus on performance, the novel suggests that personal and social identities are often deceptive constructs, and that the most terrifying deceptions are those perpetrated by the people believed to be known best.

The theme of performance is established early, when Abigail and a stranger she meets at her bachelorette party adopt the aliases “Madeleine” and “Scottie,” framing their encounter as a role-playing game detached from the reality of her impending marriage. This initial act of assuming false identities foreshadows the deeper, more sinister performances that define the novel’s central conflict. Their flirtation is not just a conversation but a one-sided script, and the vineyard setting becomes their stage. This theatricality suggests that identity can be put on and taken off like a costume, a concept that the novel’s antagonist exploits with devastating consequences.

The most elaborate performance is that of Abigail’s husband, Bruce Lamb. He presents himself as a kind, sincere, and modern partner, using his wealth to stage grand romantic gestures that solidify this persona. However, his carefully constructed identity conceals a controlling and deeply misogynistic nature. The Quoddy Resort, their honeymoon destination, serves as the ultimate theater for this deception. It is a carefully curated world where wealthy men play out ritualistic games, with the staff and guests functioning as actors in a sinister production. The resort’s rustic, off-the-grid aesthetic is itself a performance that hides a conspiracy. The narrative culminates in a horrifying ritual where the men don literal masks, an act that crystallizes the theme by making their hidden, monstrous identities visible. Swanson demonstrates that the most convincing masks can conceal the most profound betrayal.