"12 midnight in Metro Manila.

Try to remain calm as you walk down the dimly-lit streets.
If you are suddenly surrounded by a pack of dogs that appear from nowhere - these might be segben tracking down their prey.

Avoid the butcher's shop that's open at this hour.
It might be a front for a gang of vampiric aswang.

Yet, there's an even deadlier threat to the city tonight.
An ancient being that thrives on violence and thirsts for blood has found new disciples in this modern-day city.

Sacrifice has been demanded. Rituals must be executed.

When crime takes a turn for the weird, the police call Trese.

TRESE: MASS MURDERS
contains the following:
Case 9: A Private Retaliation
Case 10: Patient 414 at Mandaluyong
Case 11: The Fort Bonifacio Massacre
Case 12: The Baptism of Alexandra Trese
Case 13: An Act of War"