EVANSDALE, Iowa (KCRG-TV) — HBO Max is set to release a three-part documentary series about the abduction and deaths of Evansdale cousins Lyric Cook and Elizabeth Collins, KCRG reports. Eight-year-old Elizabeth Collins and 10-year-old Lyric Cook disappeared on July 13, 2012, while riding their bikes in Evansdale. Investigators found their bikes but no sign of the children.

Hunters found their bodies five months later, about 25 miles from where they were last seen alive. Investigators said they have followed up on 2,000 leads, but no one has been charged in the case yet.

A trailer for the HBO Max series, called “Taken Together: Who Killed Lyric And Elizabeth,” was released on Monday.