Task: Question Generation
Input (English): In 1991,a group of theives steal a rare $10 million gem,but in the process,2 of the lads double cross their leader,Patrick(Sean Bean),and take off with the precious stone. Ten years later,on the day before Thanksgiving,prominent private practice Manhattan child psychiatrist,Dr. Nathan R. Conrad,(Michael Douglas), is invited by his friend and former collegue Dr. Louis Sachs,(Oliver Platt),to examine a disturbed young lady named Elisabeth(Brittany Murphy),at the state sanatorium.Having been released on November 4, Patrick's gang breaks into an apartment which overviews Conrad's family apartment,including his wife Aggie(Famke Janssen),who has a broken leg from a skiing accident,and bright kid Jessie(Skye McCole Bartusiak), who has learned some of her father's psychological tricks. That evening.Patrick kidnaps Nathan's daughter-while Detective Sandra Cassidy(Jennifer Esposito), is called to investigate the unexplained murders of the driver and his sister of Patrick's gang 4 days earlier.The next morning Patrick forces Nathan to attempt during the holiday,to get Elisabeth to reveal a secret 6-digit number,which will ultimately lead Patrick to the whereabouts of the precious gem that has eluded him,so he and his gang can enjoy the life of luxury they all had hoped for.
Output (English): What did a group of theives steal in 1991?