Who murdered Baltimore Catholic school teacher Sister Cathy Cesnik back in 1969? This is one of many dozens of questions Netflix's newest true-crime series intends to answer.

The Keepers is a seven-part series that delves into Cesnik's unsolved murder almost half a century ago. But why look into the case now? It turns out that alumnae of the Archbishop Keough High School, where Cesnik worked, have worked in recent years to put together the pieces.

Various alumnae believe that Cesnik may have been murdered due to her knowledge about some dark secrets about the school—specifically, that the chaplain led a constitution ring. Two women have recently come forward about sexual abuse at the hands of the chaplain.

The new trailer released Wednesday seems promising, especially after Netflix's true-crime hits like Making a Murderer and Amanda Knox—but we'll just have to wait until May 19th to find out.

From: Esquire US