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We report experimental and theoretical evidence thatRb$_2$Cu$_2$Mo$_3$O$_{12}$ has a nonmagnetic tetramer ground state of a two-legladder comprising antiferromagnetically coupled frustrated spin-$1/2$ chainsand exhibits a Haldane spin gap of emergent spin-1 pairs. Three spinexcitations split from the spin-1 triplet by a Dzyaloshinskii-Moriyainteraction are identified in inelastic neutron-scattering and electron spinresonance spectra. A tiny magnetic field generates ferroelectricity withoutclosing the spin gap, indicating a novel class of ferroelectricity induced by avector spin chirality order.

Emergent spin-$1$ Haldane gap and ferroelectricity in a frustrated spin-$1/2$ ladder