The best case scenario is for Sherlock Jr. to find Sachi so that she can testify for her parents crimes and on the Kidnappers behalf. Parents get jailed, Sachi either gets fostered to parents that have a 95 percent chance of being better parents or lives alone, and kidnapper gets a reduced sentence. Remember y'all, both Kidnapper and Sachi are mentally unstable, the most moral and competent character so far is the Detective.