"An Enigma" is a short but intellectually engaging poem by Edgar Allan Poe that delves into the realm of puzzles and coded messages. The poem presents itself as a riddle, asking the reader to uncover a hidden name. Written in sonnet form, it cleverly describes the elusive woman the narrator is enamored with, while also serving as an actual enigma to solve. The first letter of the first line, the second letter of the second line, and so on spell out the name "Sarah Anna Lewig," a rearrangement of the name of Sarah Anna Lewis, a poetess known to Poe.

This poem combines Poe's love for mystery and his fascination with the human psyche. It's a prime example of how he incorporated intellectual games and puzzles into his work, merging emotional depth with cerebral engagement. "An Enigma" invites readers not only to enjoy its poetic form but also to actively engage with it as a puzzle, making it a unique piece in Poe's oeuvre.