Killed by Darkness - A Befallen Tides Story
It's uncommon for daevors to leave the safety of their enclave, but when Deja gets a job offer in New York, she can't resist the glamour. Her body is found mutilated a year later--and nobody will take action against the killers, since it would risk exposing cryptids to all of humanity.
But the victim's little sister, Winx, isn't afraid of the consequences. And she will do anything to get revenge.