A string of mysterious murders happen in an aristocratic mansion. The owners of the mansion seek CBI officer Sethurama Iyer's help to find the person responsible for the deaths.
Sanjeev imprisons a former police commissioner because the latter delays his appointment in the police force. Things take a turn when the officer frees himself and decides to take revenge.
The Indian army is at the Indo-Pak border to rescue the people of a Pak captured village. The troup has Lt. Col. Sarathchandran, Capt. Gopinath, Capt Vijayn and Capt Kabir in it. The Pak army captures them and the Jail superintendent Jafar Khan, treats them very badly. Sarina, his daughter feels sympathy for these people, as she has some Malayali relatives. So she decides to save them from the Jail...
Balamani is the housemaid looking after Unni Amma. There are three more housemaids in the house but it is Balamani's duty to look after them too. Balamani is a devotee of Guruvayoorappan (Lord Krishna of Guruvayoor). But she could never visit the Guruvayoor temple, though her house is very near to the temple. Unni Amma's grandson Manu comes to spend a couple of weeks with Unni Amma before he goes to USA. Manu and Balamani fall in love but the whole family is against their union. Will Balamani's friend Guruvayoorappan (Lord Krishna of Guruvayoor) come to their help..?
Sidharthan is a part-time actor who was the guardian of children from his village. He rents a house posing as a rich man and is visited by his old friend Ramanujan who creates chaos. The young heiress Pooja ( "Samyuktha Varma"), who is the daughter of the owner of a palace, has a haunted past. Sidharthan faces his old lover Uma and Pooja's abusive boyfriend.
This is a film on moral policing. When this film was produced, the term `moral policing' was not in the public use by the activist circles or intellectual circles. It was produced in 1993. Perhaps, the film was a bit ahead of its time . More and more cases of moral policing were discussed decades later.. The victims and survivors of moral policing in India include women, religious minorities, sexuality minorities, Dalits, Adivasis, marginalized nationalities, marginalized linguistic cultures, marginalized regions and marginalized skin colours in India. Ilayum Mullum is based on certain real incidents that took place in Kerala.