Who is telling the lie?

 It is a Sunday afternoon. 

Mr Kumar is in the house. He lives alone in the house.. 

His family is not staying with him. No one knows the reason. 

Mr Kumar is little arrogant. He wants perfection in every thing. 

Every morning 3 servants come to work. 

First one is the cook. She comes early in the morning and prepares breakfast and lunch. 

Second one is the gardener. Usually he comes at 8 o'clock. Waters the plants in the garden. He takes care of garden.

Third one is the  house keeper. He does cleaning and dusting. He washes Mr Kumar 's clothes too.

But that afternoon, when the cook had come to call Mr Kumar for lunch,  she found him dead. 

Police were informed about the incident. 

Inspector came to the spot for inspection. 

He found the dead body of Mr Kumar. 

By looking at the dead body, Inspector was sure that Mr Kumar was strangled to death. 

Inspector checked the cc TV footage of camera which is at the entrance of the house. 

No outsiders have entered the house. Not anything robbed in the house. 

Inspector concluded that someone in the house murdered Mr Kumar. 

He started interrogating the servants. 

Cook said she was busy in the kitchen. 

Gardener said he was busy in watering the plants. 

House keeper said he was busy in sorting out mails which have come up today. 

After listening to all of them, inspector arrested the house keeper for murdering Mr Kumar. 

Everyone was stunned. 

Inspector explained that house keeper is lying. He was in the house whole day as postal services are not there on Sunday s !!! 

Incident has happened on a Sunday. 

V