Heidi visits an unlikely group of detectives: the victims’ extended family. Their sleuthing upended the police’s original theory of the case. New Yorker subscribers get full, ad-free access to “Blood Relatives” and every season of In the Dark. In Apple Podcasts, tap the link at the top of the feed to subscribe or link an existing subscription. Or visit newyorker.com/dark to subscribe and listen in the New Yorker app. In the Dark has merch!