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High-resolution (0."03 - 0."09) (9 - 26 pc)) ALMA (100 - 350 GHz (3 - 0.8mm)) and VLA 45 GHz measurements have been used to image continuum and spectralline emission from the inner region of the nearby infrared luminous galaxy IC860. We detect compact (r=8-10 pc), luminous, mm continuum emission in the coreof IC 860, with brightness temperatures $T_{\rm B}>$ 280 K. The 45 GHzcontinuum is equally compact, but fainter in flux. We suggest that the 3 to 0.8mm continuum is opaque at mm-wavelengths, implying a very large H$_2$ columndensity $N$(H$_2$) of 1e26 cm-2, and that it emerges from hot dust withtemperature $T_{\rm d} \sim 280$ K. Vibrationally excited lines of HCN$\nu_2$=1f J=4-3 and 3-2 (HCN-VIB) are seen in emission and resolved on scalesof 40-50 pc. The HCN-VIB emission reveals a north-south nuclear velocitygradient with projected rotation velocities of v=100 kms$^{-1}$ at r=10 pc. Thebrightest HCN-VIB emission is oriented perpendicular to the velocity gradient.Ground state lines of HCN 3-2, 4-3, HC$^{15}$N 4-3, HCO$^+$ 3-2, 4-3 and CS7-6, show complex line absorption and emission features. HCN and HCO$^+$ havered-shifted, reversed P-Cygni profiles consistent with gas inflows of $\sim$50kms$^{-1}$. The absorption features can be traced from the north-east into thenucleus. In contrast, CS 7-6 shows blue-shifted line wings extending to -180kms$^{-1}$. We suggest that a dense and slow outflow is hidden behind aforeground layer of inflowing gas.  It appears that the centre of IC 860 is in a phase of rapid evolution wherean inflow is building up the nuclear column density of gas. A slow, denseoutflow may be signalling the onset of feedback. The inner, r=10 pc, IRluminosity can be powered by an accreting black hole and/or a compact starburstwith a top-heavy initial mass function.

The hidden heart of the luminous infrared galaxy IC 860 I. A molecular inflow feeding opaque, extreme nuclear activity