The Benson family suddenly inherits an estate outside London and a business which designs advanced Maritime Surveillance Systems for the Ministry of Defense. This attracts the interest of foreign powers who want to steal the plans. Martha, Emma and Craig, relocate with their parents to their new home, where Emma, the youngest, gets involved in mysterious incidents involving the butler George. Things hot up when the children find George dead on the lawn and the surveillance systems designs stolen. Mark Benson, the children's father, begins to investigate these shocking events but even as he interacts with his team members, he finds their behaviour suspicious. This fascinating, fast-paced and action-packed story follows the Bensons as they try to unravel the mystery that spans both their home and their business interests. In the process, the children begin to understand the values of family and chivalry.