CASTLE - "What Lies Beneath" - When Castle's idol, a famously reclusive author, turns up dead, Castle is determined to solve his hero's murder. But as he and Beckett dig deeper, they discover that truth is stranger than fiction. "What Lies Beneath" will air on MONDAY, OCTOBER 12 (10:01-11:00 p.m. ET/PT) on the Walt Disney Television via Getty Images Television Network. (Photo by Greg Gayne/Walt Disney Television via Getty Images)