Lots of twins have a special connection, but 12-year-old Matt and Emily Calder are able to bring art to life and enter paintings at will. Their extraordinary abilities are highly sought after, particularly by a secret group who want to access the terrors called Hollow Earth.

John Barrowman has appeared onstage, including on London's West End, and on-screen. He is perhaps best known for his portrayal of Captain Jack Harkness in Doctor Who and Torchwood, as well as appearances on Desperate Housewives, and Scandal. He is currently a series regular on Arrow.
Carole E. Barrowman is a journalist and a professor of English in Wisconsin.