The showdown begins Saturday between General Motors and the Cobb County couple attempting to give back a $5 million settlement and sue again over an alleged decade-long corporate cover-up of the ignition switch defect they say killed their daughter.

Cobb County State Court Judge Kathryn Tanksley has scheduled a rare Saturday session at 10 a.m. Aug. 9 to hear arguments on GM’s motion to dismiss the case filed by Kenneth and Mary Elizabeth Melton on behalf of their daughter Brooke, who died March 10, 2010. The lawsuit alleges that an ignition switch defect caused her to lose control of her 2005 Cobalt as she drove along Highway 92 in Paulding County. Melton’s Cobalt skidded into another vehicle, then rolled down a bank. She died that evening.