The story itself isn't consequential in the grand scheme of things, but is just a sort of slice-of-life/battle story. It's pretty short, about 1 hour in length. Basically, it follows The Masque of the Fading Dawn, led by the Great Harlequin Duruthiel. It starts with The Masque of the Fading Dawn hanging out in the webway. They sally forth and do battle with Orks, first in the air using vehicles, then hand-to-hand with a few cool set pieces. Besides just the fight scenes there lots of funny quips and some character growth and revelation for Duruthiel. Posistive mood overall.
Some music, liberal use of sound effects, and the cast of voice actors make this an audio drama, as Killersquid said. Good production value.