You’re a “designer baby” genetically equipped with precocious genius. Surely you’d also be programmed with the sense not to behave like a cut-price Midwich Cuckoo? Not, it seems, in Peter James’s impassioned and timely warning about the dangers of messing with DNA, which translates a decade’s research into a melodrama of terrifying, mad scientists and murderous cults. James has produced a suitably breathless fan-pleaser about accelerating evolution.