Detective Kate Morgan arrives at a broken-down house, supposedly the site of a suspicious death, only to receive a screaming warning from Simon not to enter the building. Turns out, she had been given the wrong address but does find a dead body at the corrected address.

As Kate sorts out whether she has a Black Widow on her most recent case, Simon tries to help a homeless man, who ends up in the morgue—now one of Kate’s newest files because that poor man’s body had been found in the broken-down house. That’s nothing compared to what else she finds on the premises.