The Keddie Murders
There was a supposed breakthrough in the case in August 2020, with investigators claiming that they were closing in on their target. However, this wasn't reported on widely and could have been a fluke.
Most invested countries:
Interest relating to documentary:
There were sporadic spikes in searches for the documentary in July and October of 2020, but interest peaked in September 2017 when the documentary came out. After about 18 months of no interest, the sudden reignition of searches appears to match a timely breakthrough in the case.