Bob, a single father working in a telecommunications company, receives a distressing phone call from Grace, a stranger who claims to have been kidnapped. She tells Bob that she was abducted by a gang after witnessing a murder and that her young daughter is also in danger. The kidnappers are unaware that Grace has a cell phone and are demanding a ransom for her release. Bob becomes Grace's only hope for salvation as she begs him to help save her and her daughter. Despite initially doubting the authenticity of the call, Bob decides to take action, driven by a sense of duty and the haunting memories of his own family's tragedies.

As Bob embarks on a perilous mission to rescue Grace and her daughter, he must use his skills and knowledge of the city to outmaneuver the kidnappers. His quest pulls him into a dangerous world far beyond his everyday reality, challenging him both physically and morally. Along the way, Bob forms a unique bond with Grace through their phone conversations, a connection that becomes their greatest asset. As the situation escalates, Bob also becomes entangled with the police, who are investigating the murder connected to Grace's kidnapping, further complicating his mission to save the hostages before time runs out.