"The Secret Mitchell" was a storyline in the BBC soap opera EastEnders involving the characters of Ronnie Mitchell (Samantha Womack) and Danielle Jones (Lauren Crace). The build-up to the storyline began in the episode broadcast on 18 August 2008 in which Danielle was introduced as a friend for Stacey Slater (Lacey Turner) and a love interest for Callum Monks (Elliott Jordan). The storyline gained more pace in October 2008 when it was revealed that Danielle was actually the daughter of Ronnie and that she came to Walford to find her.
Throughout late 2008 and early 2009, Danielle attempted to befriend Ronnie in the hope to build a relationship with her so she would accept her as her daughter when she told her about who she was. By spring 2009, Ronnie's father Archie Mitchell (Larry Lamb), who was responsible for Danielle, then called Amy, being put up for adoption when Ronnie was fourteen, discovers who she is, and attempts to persuade her to leave Walford and then plans to murder her which doesn't go through.
The storyline climaxed on 2 April 2009 when Danielle finally found the strength to tell Ronnie that she was her daughter, but Archie lies to Danielle about him telling Ronnie the truth. This proceeds Ronnie to throw her out, rejecting her. Ronnie shortly finds out that she was telling the truth and finally reunites with Danielle before being ran over by Janine Butcher (Charlie Brooks), subsequently killing her, leaving Ronnie devastated and immensed with guilt for the way she treated her.
The episode which saw Danielle revealing to Ronnie that she was her daughter was watched by 11.46 million viewers. It became one of the most dramatic storylines in EastEnders and also impacted Stacey's bipolar diagnosis storyline and the "Who Killed Archie?" storyline.