Is the sequel to Adept and continues the story a year after the events of that book.
However, unlike the former which is told in third person, Finn switches to first person in the form of the brilliant but deeply troubled Jo Hallett. Jo is a member of the academic project that David and Susan are now part of but excluded from their elite inner group. This change of perspective works well as it is not necessary to have read Adept to enjoy Ex Machina because as Jo begins to investigate the inner group she learns of the former events. It is these investigations that leads her down a dangerous path where again lives are under threat from quite unreasonable people.
Again an engaging thriller without being brilliant.
Finn develops more of his ideas about magic in this second book and given the number of questions left open at the end, he may well be writing another volume in the series in the future.