In 1188 AD, in Limerick City, Ireland, a shadowy chase unfolds through a dense forest. A red-cloaked figure darts away on horseback as templar knights urge their mounts forward. The pursued figure reveals herself as a banshee, and her terrifying scream cuts through the night, killing several knights. The last knight meets the banshee with a magical cross-shaped shield that folds into a cube around her head, severing it and sealing the creature away for centuries.
In present-day 2011, at a university, Professor Isla Whelan [Lauren Holly] is immersed in an artifact cataloging project with students when a mysterious box arrives. Inside lies an Irish gauntlet and a hand-drawn map marked “section 3,” a rarely used storage area that hints at a much older danger. Otto and Shayla Whelan’s daughter uncover a hidden room behind a false wall, and within a crate bears the name “DUNCAN.” Inside the crate sits the same two-part armor and the box that once defeated the banshee eight centuries earlier. When Isla uses the armor to pry open the box, the lid reveals a mummified banshee head. As soon as the head’s eyes flicker open, it lets out a scream that makes ears bleed and knocks everyone nearby unconscious. The scream even troubles a university security officer, causing his earpiece to fail before the creature bursts into flame and disintegrates, leaving behind a chilling reminder of the threat they face.
That night, the haunting rumor of the banshee’ s scream follows each person who heard it. Isla Whelan [Lauren Holly] experiences the intrusion in her sleep, Otto is haunted while he plays a video game, and Janie feels the presence while she bathes. The next day, the team connects the crate to the figure behind the legend: Broderick Duncan [Lance Henriksen], a once‑esteemed professor who was dismissed on an assault charge and has since become a controversial internet “doomsday prophet.” They also learn that Duncan once had an assistant, Samuel Page [Eric F. Adams], who might know where he can be found now. The group reports Officer Sioux’s (the character, not the banshee) body discovered in section 3 and continues to push forward, hoping to stop the menace before it resurfaces.
Whelan sets out to locate Duncan with Page, taking Otto, Shayla [Marcelle Baer], and Shayla’s boyfriend Kurtis [Garrett Hines] along for the ride. A crash during Isla’s drive to Duncan’s house kills Kurtis, forcing the others to press on on foot. When they reach the secluded home, Duncan welcomes them inside but soon turns hostile, firing at them and demanding the mysterious box and shield. After a tense standoff, Duncan agrees to aid in their quest, offering a crucial weapon—a two‑pronged sword that can expose the banshee’s vulnerability. The plan hinges on weaponizing the sword and the magical shield to strike at the creature.
The confrontation comes as the banshee materializes in the form of the dead Kurtis and lunges at Shayla. Isla Whelan uses the two‑pronged sword to pierce the banshee, and together with the shield, they sever the creature’s head. In a final, desperate moment, a mortally wounded Duncan tries to flee with the precious box, but Shayla stands firm and ends his life with the sword. The film closes with a nod to a classic adventure finale as the banshee’s head is sealed away in a new crate and stored in a warehouse, echoing the ending of a legendary treasure‑hunt epic. The myth has returned, but so has a resolve to keep it buried again.
