In this Dateline classic, two tenacious daughters set out on a quest to fulfill a promise they made to their mom. Listen as these daughters-turned-detectives try to solve the mystery surrounding their mother’s death. Keith Morrison reports. Originally aired on NBC on May 2, 2014.

Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.