"The Masked Angel" features the first literary appearance of Patricia Holm, Templar's on-again, off-again partner/girlfriend, since the 1940s novel The Saint in Miami.

For the remainder of his time writing the series, Charteris would use the short story format and the next Templar book to feature novellas would be The Saint on TV, published in 1968, with featured adaptations of episodes from the 1962-68 television series based on the character.

Most notably, the character of Avalon Dexter, introduced in the preceding book as a new romantic (and adventure) partner for Templar, cast in the same vein as Patricia Holm, is absent without explanation, with Templar once again working with his earlier partners, Hoppy and Patricia.

"The King of the Beggars" was adapted as an episode of the TV series The Saint which first aired on November 14, 1963 during the second season.

"The Masked Angel" was retitled "The Crooked Ring" and adapted during its fourth season, first airing on July 15, 1965.