Tommyinnits guide on how to catch a sociopath

Tommy- a training officer/detective- finds himself in the middle of a murder case after an unfortunate accident leaving his idol and older brother out of commission. With his only help being his best mate- a paramedic and his supervisor- an old man, tommy finds himself trying to stop the biggest criminal in the business.
Tw: Blood. Near death experiences. Very bad things associated with police and detectives. Will try to put trigger warnings at chapters, but don't count on it.