The Twisted Window offers a tapestry of characters that defy the conventions of typical suspense narratives. Each individual navigates dual perspectives, enriching the narrative with complexity before it reaches its climactic end. When the handsome Brad steps into the unassuming town of Winfield, the ever-curious Tracy, like any typical teenager, is both delighted and wary of his attention, sensing an enigma behind his charming façade. Though he masquerades as the latest addition to Winfield High, Tracy's keen instinct soon unveils his true purpose—Brad is on a mission, not for friendship, but to reclaim his half-sister with a determination that intrigues her. Despite her empathy for Brad's plight, Tracy's own wounds from her mother's death and feelings of abandonment by her father render her skeptical of others’ intents. Yet, as she learns of Brad's fractured family, a bond forms, pulling her into his audacious plan to abduct a local child. Her sharp mind, however, later discerns inconsistencies in Brad's tale, eventually leading her to guide him towards a pivotal, life-altering insight.

From his debut in the story, Brad exudes the confidence and fearlessness of youth, entrusting Tracy with a vivid narrative of his half-sister's "abduction" by a nefarious stepfather. His tale, rich with imagined torment and his mother's distress, resonates deeply with Tracy, who projects her own familial grievances onto Brad’s saga. Brad, appearing earnest in his quest to rescue his "taken" sister for his mother, persuades Tracy to join his cause. Together, they embark on the daring endeavor. Yet, as events unfold, Brad develops a strange "blindness" to the reality Tracy perceives. Her realization that they have unwittingly taken a child unrelated to Brad forces him to confront harsh truths. Rather than a sinister abductor, Brad emerges as a tragic figure burdened by guilt, his true nature revealed in a thrilling twist that introduces an unexpected character, adding another layer for Duncan's readers.

Initially, the novel paints figures like Brad's stepfather, Gavin; Gavin's sister and her husband, the Carvers; as well as Tracy's aunt and uncle, Rene and Cory, in overcast hues. Yet, as the narrative lens shifts, these characters unveil unforeseen facets. Brad's perception of a tumultuous family history is unveiled as a mere construct of his imagination, while Tracy's father's genuine concern surfaces in the story's resolution. Brad's mother, a figure shrouded in mystery, is seen only through the interpretations of others and a solitary phone call with Tracy, her character departing significantly from Brad's portrayal.

The theme of the novel weaves a narrative where appearances hold sway, epitomized by Tracy's view through a distorted window. In the final chapters, Brad's embrace of truth unfurls as a poignant testament to self-forgiveness. Jamie exemplifies the steadfast loyalty of friendship, while concepts of home and family are imbued with newfound warmth as Tracy finally associates "a vision of Winfield" with her conception of "home."