Poor Unfortunate Soul: A Tale of the Sea Witch is a novel written by Serena Valentino the writer of Fairest of All: A Tale of the Wicked Queen and The Beast Within: A Tale of Beauty's Prince. Based on The Little Mermaid, it serves as a backstory for Ursula the Sea Witch and explains her past, her relationship with King Triton, her place in the kingdom of Atlantica, and what caused her to be banished from there as well as the events that led to her demise.
- The dust jacket stated that this was supposed to be the final book in the series. However the ending heavily implied that another book would be released and focus on Maleficent. This was later confirmed.