  We discuss a flavourful $Z'$ portal model with a coupling to fourth-family
singlet Dirac neutrino dark matter. In the absence of mixing, the $Z'$ is
fermiophobic, having no couplings to the three chiral families, but does couple
to a fourth vector-like family. Due to mixing effects, the $Z'$ gets induced
couplings to second family left-handed lepton doublets and third family
left-handed quark doublets. This model can simultaneously account for the
measured $B$-decay ratios $R_{K}$ and $R_{K^*}$ and for the observed relic
abundance of dark matter. We identify the parameter space where this
explanation is consistent with existing experimental constraints from dark
matter direct and indirect detection, LHC searches, and precision measurements
of flavour mixing and neutrino processes.
