There are murderers and then there are serial killers. There's usually some sort of motive behind most homicides but when it comes to serial killers, motive gets replaced by this psychological urge to kill; most often devoid of any logical reason or personal vendetta against the victim. India has had its fair share of serial killers. Most often, they were eventually apprehended, but there are cases where the wrong person was arrested (and then let go) and then there are some cases that still remain unsolved. These cold-blooded Indian serial killers will send shivers down your spine.

5. Charles Sobhraj - The suave 'Bikini Killer'

Despite the infamy, Charles Sobhraj is one of the most "famous" murderers around. From 1975 to 1976, he murdered around 12 people in various places in South East Asia. Unlike most other serial killers, Sobhraj had a motive - rob his victims to fund his flamboyant lifestyle. His usual method was to first gain the trust of tourists and potential victims by rescuing them from problems that he had created in the first place, and then defrauding them. The bodies of two of the women he killed were found in floral bikinis, earning Sobhraj the nickname, 'Bikini Killer'. He was arrested in India where he served a sentence from 1976 to 1997, after which he retired to Paris. He was even approached for book and movie rights to which he quoted exceptionally high amounts. He returned to Nepal in 2004, where he was arrested again. He is now serving a second life sentence. Actor Randeep Hooda is set to portray Sobhraj in the upcoming film Main Aur Charles.

6. Cyanide Mallika - The Agony Aunt of Death

Mallika, a woman living in Bangalore, killed 6 women from 1999 to 2007. Her modus operandi was quite twisted. She used to pretend to console lower middle class women who were facing domestic issues and then killed them through cyanide poisoning. She used to then rob them of their belongings. She was arrested in 2007, awarded a death sentence in 2012 which was then reduced to a life sentence later that year.