  We report the discovery of a candidate dual QSO at z=1.889, a redshift that
is in the era known as "cosmic noon" where most of the Universe's black hole
and stellar mass growth occurred. The source was identified in Hubble Space
Telescope WFC3/IR images of a dust-reddened QSO that showed two
closely-separated point sources at a projected distance of 0.26", or 2.2 kpc.
This red QSO was targeted for imaging to explore whether red QSOs are hosted by
merging galaxies. We subsequently obtained a spatially-resolved STIS spectrum
of the system, covering the visible spectral range, and verifying the presence
of two distinct QSO components. We also obtained high-resolution radio
continuum observations with the VLBA at 1.4 GHz (21-cm L band) and found two
sources coincident with the optical positions. The sources have similar black
hole masses, bolometric luminosities, and radio loudness parameters. However,
their colors and reddenings differ significantly. The redder QSO has a higher
Eddington ratio, consistent with previous findings. We consider the possibility
of gravitational lensing and and find that it would require extreme and
unlikely conditions. If confirmed as a bona-fide dual QSO, this system would
link dust-reddening to galaxy and supermassive black hole mergers, opening up a
new population in which to search for samples of dual AGN.
