Netwalk's Children. Netwalk Sequence, #4

IN A TECH-DRIVEN FUTURE, ESTRANGED SIBLINGS UNITEMelanie Fielding and her brother Andrew Landreth-Stephens may not have always agreed on much over the years. But when it comes to their children, and the potential threat presented to them by the mysterious device called the Gizmo, Melanie and Andrew are in firm agreement. The Gizmo is toxic. They will not expose their teenaged children to the device's manipulations. However.
This choice means that neither Melanie nor Andrew are allowed access within the inner circles of the Corporate Courts, which manage and control the Gizmo-and the Courts, led by their mother Diana, scheme to bring their children under Gizmo's control. Meanwhile, the Gizmo is stirring. It just takes one big mistake by Andrew's son Rick-and an error by Melanie's daughter Bess-to upset a delicate balance of fifteen years.
Can Bess, working with her dead Netwalker great-grandmother Sarah and her cousin Rick, manage to thwart the aims of Gizmo, Diana, and the Corporate Courts? What will be the price they pay for resisting Gizmo?