Thus Raavan knew from a couple of sources that there will be a Raam in Dashrath's house. He will be exiled, and He will live here somewhere nearby along with His brother and wife. Raavan will have a fight with him (by Sanakaadi Muni) and He will kill him (by Raajaa Maandhaataa).

Well, when Shoorpankhaa reported the incident of Khar and Dooshan to him, he had already decided that he would have a fight with Raam. That is why he did not listen to anybody. In Maanas, when his wife Mandodaree advised him on every step but he always consoled her by saying something or the other. He doesn't listen to Maareech who had the first hand experience of Raam's arrow, Maalyavaan (his Naanaa's real brother), Vibheeshan (his own brother), even Kumbhkarn (his own brother) when after waking up he tries to stop him from fighting with Raam; and Kaalnemi to whom he sent to kill Hanumaan.

As he hears the account of Shoorpankhaa, he gets ready to break war with Raam. He can't think of any other way except to abduct Seetaa. He goes to Maareech and tells the way. Maareech should go to Panchvatee in the form of a golden deer. Seetaa will definitely get attracted to him and ask Raam to bring him or his skin. Raam will also go after him. The deer will take him very far from the hut, then he will cry in Raam's voice "Haa Raam, Haa Seetey". This will scare Seetaa and She will send Lakshman to take care of Raam. Until both come back to hut Raavan should get enough time to abduct Seetaa. Plan was perfect. It worked as it was thought.

First Maareech was not prepared to go there and he tried his best to advise Raavan not to break war with Raam who is the Swaamee of Trilok, but Raavan said - "If you won't go there, then I will kill you." So Maareech thought that it was better to be killed by Raam's arrow instead of Raavan's. So he agreed.

The plan worked Raam and Lakshman went away from the hut. Raavan arrived there in the form of a Sanyaasee, but talked about Seetaa's beauty which opened his secret of not being a true Sanyaasee. But Seetaa couldn't do anything except to engage him until Raam and Lakshman come back. But they were very far. In the meantime Raavan lifted Seetaa, put Her on his chariot and took Her to Lankaa. Jataayu saw Raavan taking Seetaa in his chariot, he tried his best to stop him to take Seetaa away, but he could not succeed. Rather he lost his wings and Raavan left him half-dead. 

Raavan brought Seetaa to Lankaa and kept Her in his best garden Ashok Vaatikaa. He had instructed his maids to take their best care of Her. He often came there to see Her and to see that She was in the most comfortable condition. When Hanumaan was hiding to see Seetaa, he threatened Her that if She didn't obey him in one month time he would kill Her. Seetaa became very desperate hearing this and wanted to immolate Herself. But Trijataa who was a Raam Bhakt and was an elderly Raakshasee, postponed it until tomorrow saying that it was very late night and she wouldn't get fire anywhere.

After meeting Seetaa, Hanumaan thought to show his presence to Raavan also, so he destroyed Ashok Vaatikaa. Guards reported this to Raavan. Raavan sent many mighty Raakshas including his youngest son Akshaya Kumaar, but Hanumaan either killed them or pushed them back. Then Raavan had to send Meghnaad to arrest him. He used Brahmaastra. Hanumaan pretended to be unconscious only by seeing it. Then he tied him with Naag Paash and brought him to the royal court.

There Hanumaan met Raavan and got influenced with his glory. He also tried to advise Raavan to return Seetaa to Raam, but Raavan was adamant on his decision. So he ordered to kill Hanumaan. With great difficulty Vibheeshan convinced Raavan that messengers are not to be killed, instead his body part could be cut and he should be sent back to his place. Raavan agreed to it so oil-drenched cloth was tied to Hanumaan's tail to set fire in it. It is said that at that time Lankaa's all cloth and oil were finished. Fire was set to his tail. With that fire Hanumaan burned the whole Lankaa except Jaanakee's living place and Vibheeshan's palace. Thus one monkey burned the whole Lankaa.