Sigma². Darkwater Files: Bad Blood, #2

With the Snow investigation in limbo, Sandoval and Krypsek are called to an unusual scene where the victim was tortured before he died. Immediately, Krypsek understands they need expert assistance to sort through what clues might remain and calls London Winchester to help. The pathology is disturbing to everyone involved, but when London receives an odd threat, they know the killer is watching.