In the taut thriller Deadly Sign-In, a routine day at a trendy boutique hotel spirals into a nightmare when a mysterious digital check-in app begins targeting guests with deadly precision. The story follows Emma, a sharp-witted front desk manager played by Ella Frazee, who discovers that the hotel’s new sign-in system is not just collecting personal data—it is using that information to orchestrate a series of terrifying, seemingly accidental deaths. As the body count rises, Emma teams up with a skeptical security guard portrayed by Mike Markoff and a tech-savvy guest portrayed by Nicole Acosta to uncover the truth behind the algorithm. Their investigation leads them through a maze of corporate secrets, hidden identities, and a chilling conspiracy that blurs the line between technology and terror. Directed by Haylie Duff, this gripping thriller blends modern anxieties about digital surveillance with classic suspense, keeping viewers on edge as Emma races against time to shut down the deadly system before she becomes its next target. With a tense atmosphere and a cast including Courtney Elvira, Gabrielle Leonore, Rick Moose, and Caleb Grandoit, the film delivers a chilling reminder that sometimes the most dangerous threats come from the devices we trust the most.