Red Finger (2011)

"Red Finger" is a 2011 Crime movie directed by Keigo Higashino and starring by Hiroshi Abe, Meisa Kuroki. A 7 years girl is found dead in the local park’s toilet. Kaga Kyouichiro, who was asked to find the girl, and his cousin Matsumiya Shuhei who’s assigned to investigate the murder case, have to work together to crack the case. Their evidence lead them to Maehara’s, a family with parents, a son and a senile grandmother.