Who doesn't love a twisted and lengthy real crime murder mystery series? And as we've seen with the first season of Making a Murderer, Netflix does a great job with them. That's precisely why we're looking forward to their new seven-part docuseries The Keepers, which tells the story of Sister Cathy - a Baltimore nun who was murdered four decades ago.

The series goes in deep, as friends, relatives, journalists and the citizens of Baltimore attempt to uncover the truth about her death. It hits the streaming service on May 19. Watch the trailer below.