Red Finger(赤い指～｢新参者｣加賀恭一郎再び！)

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.