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Abstract An alternative left–right model of quarks and leptons, where the $$SU(2)_R$$ SU(2)R lepton doublet $$(\nu ,l)_R$$ (ν,l)R is replaced with $$(n,l)_R$$ (n,l)R so that $$n_R$$ nR is not the Dirac mass partner of $$\nu _L$$ νL , has been known since 1987. Previous versions assumed a global $$U(1)_S$$ U(1)S symmetry to allow n to be identified as a dark-matter fermion. We propose here a gauge extension by the addition of extra fermions to render the model free of gauge anomalies, and just one singlet scalar to break $$U(1)_S$$ U(1)S . This results in two layers of dark matter, one hidden behind the other.