Based on the search results, "What Once Was Mine" is a book by Liz Braswell, which is the 12th installment in Disneys Twisted Tales series). It is a retelling of the story of Tangled, where Rapunzels hair has the power to kill rather than heal. The book is about the search for the all-healing Sundrop flower to cure the queen and her unborn child. The story is changed around in small ways, while minor details from the film are largely expanded on throughout the novel. The book has received positive reviews from readers.