When her son is kidnapped, hairdresser to the stars Marin is transformed from success story to suicide risk in Jennifer Hillier’s Little Secrets (Corvus £12.99). And then she learns her husband is sleeping with an art student called Kenzie, and reacts by paying $250,000 to have her murdered. Neither Kenzie nor the relationship is quite as Marin assumes, and every other character’s surface is shown as equally deceptive as shock after shock follows. Other psychological thrillers indebted to Gone Girl tend to be icy displays of narrative trickery. Little Secrets is just as cleverly plotted, but is given a heart by the through-line of its protagonist’s emotions about her missing child, which shape her misdeeds and mistakes.