ambient

dark

darkness

sneaking

sneaky

stakeout

stake

out

crime

criminal

serial

killer

spooky

underscore

scary

pensive

nervous

damp

cold

nerve

unnerving

tense

chilling

ominous

foreboding

distant

creepy

ghost

ghostly

screeching

screechy

mystery

mysterious

discovery

investigation

hidden

hiding

creeping

csi

sneak

unnerve

screech

hide

creep