  We show that by adding a single new scalar particle to the Standard Model, a
TeV-scale leptoquark with the quantum numbers of a right-handed down quark, one
can explain in a natural way three of the most striking anomalies of particle
physics: the violation of lepton universality in $\bar B\to\bar K\ell^+\ell^-$
decays, the enhanced $\bar B\to D^{(*)}\tau\bar\nu$ decay rates, and the
anomalous magnetic moment of the muon. Constraints from other precision
measurements in the flavor sector can be satisfied without fine-tuning. Our
model predicts enhanced $\bar B\to\bar K^{(*)}\nu\bar\nu$ decay rates and a
new-physics contribution to $B_s\!-\!\bar B_s$ mixing close to the current
central fit value.
