The film 's idea occurred to Ayr in 2014 when he was reading articles about how Delhi had been put under scrutiny , especially after the 2012 gang rape case . Affected by reading the incidents , Ayr went through several articles and interviews on what the Delhi police go through and was interested in how a woman in the police force would react to a case of sexual violence . He spent time with several Delhi police personnel and observed their daily routine for the research . The film was shot for 24 days in Delhi in February 2017
2012 gang rape case
2012 Delhi gang rape
Soni (film)