"The Holiday Swap" revolves around identical twins Charlie and Cass Goodwin who decide to switch lives during the holiday season. Charlie, a chef and reality show judge, loses her sense of taste and smell, while Cass deals with personal issues at their family bakery. Their switch leads to unexpected complications and romantic encounters.

The main characters in "The Holiday Swap" are Charlie Goodwin, a successful chef and reality show judge, and her twin sister Cass Goodwin, who manages their family bakery. Other significant characters include firefighter Jake Greenman and physician assistant Miguel Rodriguez, who become their romantic interests.

"The Holiday Swap" explores themes such as identity and self-discovery, the importance of family and sisterly bonds, and the magic of finding love in unexpected places. The story highlights how stepping out of one's comfort zone can lead to personal growth and new perspectives.