For three months last year, Michelle Hadley sat in a California jail, accused of the harassment and attempted rape of her ex-fiancé’s wife, Angela Diaz.

The specifics of the allegations were astounding: Hadley was accused of posing as Diaz on Craigslist and soliciting men to attack her via “rape fantasy” ads.

In January the already bizarre case took a turn: Authorities said it was Diaz herself — and not Hadley — who had devised the plot and allegedly filed a false rape claim in an effort to frame Hadley.

Hadley has since been officially exonerated. Diaz, who has pleaded not guilty...