This episode is about the Villisca axe murders from 1912. Eight people end up dead and while there were a few leads it remains unsolved. It gets a little gruesome but I do not go into too much detail.
CITED SOURCES:
https://en.wikipedia.org/wiki/Villisca_axe_murders
https://iowacoldcases.org/case-summaries/villisca-axe-murders/
https://www.villiscaiowa.com