From a murder-prone mistress to a killing farm that inspired a Clint Eastwood movie, rural Southern California has secrets that belie its bucolic setting.   The Wineville Chicken Coop Murders--a horrible 1928 national news story that inspired the 2008 movie The Changeling from director Clint Eastwood--are only the most infamous despicable deeds that have bloodstained the rural countryside between Riverside City and the San Bernardino County line. Jurupa Valley has been a region of dark doings and scandalous misdeeds for generations. The city of Jurupa Valley was formed in 2011 from the area's smaller communities, including Wineville (renamed Mira Loma to escape the shame), Pedley and Rubidoux. Buried in its landscape are salacious sagas of unchecked bootlegging, payday orgies and gruesome murders. Author Kim Jarrell Johnson digs deep to disinter the unsavory stories that have traditionally marked her home city as a resting place of enduring infamy.   Includes photos!