The action takes place in the near future, 2022. The FBI is beginning to use a new technology: reading the residual signals of the human neural network. Scientists have established where the memory is stored and learned to read it. Which means FBI agents can now see everything the victim saw. Including the attackers' faces.
John Victor is a former cop. He will have to pass an exam to be transferred to a special department V, specializing in the use of this technology.