Angel is an angel. What a brilliant idea. Her sister is in a lot of trouble with the powers upstairs. Angel comes down to earth to try to mend her sister's ways, and along the way they straighten out a lot of guys (if you know what I mean).
Black Angel features two memorable Couplings, both of which involve Viper. She does a three-way with Sasha Gabor and Don Fernando, and then tackles Ron Jeremy's major leaguer towards the conclusion of the tape.
There's nothing new here in the way of Story or sex, but there are some entertaining interludes (mainly Viper's). Black Angel is no worse or better than others of its ilk, but will probably be a solid mover because of Viper, Angel and its integrated action.