Archangel

In 1997 an angel fell to Earth. Dave Peters, and his sidekick in the San Francisco police squad, Danny, were right there at the time. Caught up in a supernatural war between good and evil, they had eventually tracked down the rogue entity and brought an end to its reign of deadly fire. But now the stakes had risen. It's 2002, and there's a demon abroad in London, a soul so corrupt and foul that Satan himself has recruited him from the legions of the dead.
Only one entity in Heaven can counter his power - an Archangel, an angel of the highest rank.