Had a vivid dream related to this.

I was a homicide detective in Sacramento Ca. There were grisly murder sprees in the seedy part of town. My partner and I had to work nights to help out. He called out to go on a anniversary night out with his wife. I went in to get up to speed. Then I went out to the area of the killings to stake it out. The only description of the suspects were black clothes and sunglasses. After several hours I decided to walk around. It was getting cold I was glad I had my long black leather coat on. Halfway up the block several young men in black clothes came out of a brick row house and headed up the street. As I passed the house the door was open. I grabbed my surefire light and glock 32 .357sig. Inside was blood, gore & torn up bodies. I headed back out and tailed them from a distance. The got in a midsize car and pulled out turned back and left. I sprinted to my car around the corner and followed them. The streets were fairly empty. I called it in. They got on the interstate and headed north for several hours. They pulled off into a parking area for a state park. I turned off my lights and pulled into the 1st entrance they passed. I coasted into a parking space and followed them up a trail into the forest. Eventually there was a rock side of the mountain they went around a corner. As i peeked around the corner some kind of a rock door was opening and they went in. After a bit it started closing and I quickly snuck in. It was very dimly lit and opened up to some kind of hallway vestibule. I stayed close to the rock wall and headed down the sloping floor. It widened and came out to a road like walkway with higher ceilings. I looked up to the left and there was a sign that said “North-Seattle”. I looked right and saw “South-SanFrancisco-LA”. Looked up straight ahead it said “East Coast-Paris”. I heard the door opening and more “people” coming in as they got close I saw they had big black alien type eyes. I quickly turned putting on my sunglasses pretending I could read the map on the wall. As soon as they cleared the corner I bolted for the closing door. As I was flying out of the parking lot and tearing back south I woke up.