On the Record World top Singles Chart "Undercover Angel" performed much more strongly than on Billboard's Hot 100, logging four non-consecutive weeks at #1,[6] and spending a total of 10 weeks in the top five (June 18, 1977-August 20, 1977).

[7] In 1977, Warner Bros. Music decided to form a special label, Pacific Records, for their composers who also performed.

The song, which O'Day described as a "nocturnal novelette", was released without fanfare in February 1977.

The success of these two songs means O'Day is among the few singer-songwriters who wrote a chart-topper for themselves and one for another artist.

The song begins with a man describing his loneliness, when a woman suddenly appears in his bed and encourages him to make love to her.