Miracle Monday

Blurb

Miracle Monday is a novel written by Elliot S. Maggin, starring the DC Comics superhero Superman. It was published in 1981.
Miracle Monday tells the story of Superman, trying to stop an entity of pure evil from causing universal chaos. This is Elliot S. Maggin's second Superman novel, following Superman: Last Son of Krypton. The story introduces the time traveler Kristin Wells. The character later appeared in the Superman comics, both as herself and as Superwoman.
The novel introduces the holiday Miracle Monday, which occurs annually on the third Monday of May. The holiday would also makes an appearance in the Superman comics.