Wondrous Strange is a novel by author Lesley Livingston. The story follows the main character, Kelley Winslow, as she tries to make it in theater after moving to New York City. Kelley is in Central Park practicing her lines after finding out she has to take on the lead role as the understudy of Titania in A Midsummer Night's Dream. Kelly catches the eye of a handsome stranger, who gives her a rose and then disappears.

On her way out of Central Park, Kelley saves a horse from drowning in one of the lakes. In her struggle with the horse, she leaves behind some of the pages of her play with the theater address. The handsome stranger, Sonny Flannigan, turns out to be a Janus guard for the Otherworld. He thinks Kelley is in danger because the horse that winds up inside of her bathroom is a kelpie or a Fae from the Otherworld. When Sonny starts showing up at Kelley's theater, she thinks that he is stalking her.

While Sonny and other 12 Janus guards go to Central Park, which is the gateway between the mortal world and the Otherworld, for the nine nights every nine years to keep the Fairy Folk from entering the mortal world, Kelley is trying to figure out how a horse got into her bathroom and how to get the horse out of her bathroom.

In the end, Sonny and Kelley discover that Kelley is not a mortal. She is the abducted daughter of Auberon, the King of Winter in the Otherworld. The horse, Lucky, in Kelley's bathroom is no ordinary horse, but the roan horse, which is an enchanted horse. With the right situation, the roan horse and its rider are there to hunt Kelley down and kill her so that Auberon can continue to rule without a threat to his life. Sonny and Kelley end up falling in love and protecting the mortal world from being overrun by the Fairy Folk. Sonny had to return to the Otherworld to serve his duties to the king, so all that's left now is for Kelley to figure out how to get Sonny back to the mortal world for good.