Kardia weaves fiction and science to tell the story of Hope, a pathologist who embarks on a journey of reconciliation. Hope discovers that the experimental heart operation she underwent as a child has mysteriously linked her life with another. To unlock the secret of her past, Hope must revisit her childhood and explore regions of her life that have heart stopping results.

Chelsea Jones, a Chicago-based dance instructor whose adoptive parents have long since passed, travels to the small European country of Havenshire over Christmas break in search of her heritage… and maybe even family. Discovering that the only way to get access to information she needs on her quest is via the royal family, she accepts an offer to teach a very reluctant Prince a special Waltz for the traditional Royal Christmas Ball.

Longtime friends and local radio hosts Maggie and Jack fake it as a couple for their families and listeners in hopes of getting their show syndicated.