"So direct us to a paper which tells us how gravity works, and what is actually is."

Newton, I., 1687, "Philosophiæ Naturalis Principia Mathematica " tells you how it works in most terrestrial situations.

Einstein, A., & Grossman, M., 1913, Zeitschrift für Mathematik und Physik, 62, 225–244, 245–261, tells you how it works in the limit of high accelerations.

There is some question about how it works in the limit of low accelerations, see for instance:

Milgrom, M., 1983, "A modification of the Newtonian dynamics as a possible alternative to the hidden mass hypothesis". Astrophysical Journal 270: 365–370.

As to "what it is" there are a few papers on that,one would be:

Higgs, P., 1964, "Broken Symmetries and the Masses of Gauge Bosons". Physical Review Letters 13 (16): 508–509.