Actress Dana Delany ("Desperate Housewives") will guest star in two episodes of "Castle" airing Sunday, March 21 and Monday, March 22 (both nights 10:00-11:00 p.m., ET) on ABC. This will reunite Delany and Nathan Fillion, who played Dr. Adam Mayfair, the younger husband of Katherine Mayfair (Delany) on "Desperate Housewives."

HEAT WAVE by Richard Castle, star of the hit ABC series "Castle" (Mondays, 10:00-11:00 p.m., ET), has been a successful cross-platform collaboration between ABC and Hyperion. Published at the end of September 2009, HEAT WAVE has spent 14 weeks on the New York Times Hardcover bestsellers list, currently holding the #32 position for Sunday, January 17, 2010. Hyperion has gone back to press eight times and now has over 170,000 copies in print. With this great success, a second book from Richard Castle will be published at the end of September 2010.