serial killers are like are very special and unique killers usual other normal killers have motive to kill someone but serial killers do not have motive they just kill for fun and to show their power to the world that they can do. in some cases serial killers keep a watch on their prey for months and when they get the chance they kill them. they have a pattern of killing and police comes to know only after 3 or 4 murder only so it is very difficult to recognize their pattern of killings so in order to catch them you need to be very sharp because they don't wait they keep on killing till they are not satisfied or happy so you need be sharp and efficient so you can get them very fast if you are doing the work on time and planning very carefully you can get the serial killer.