Watch the new 'Paranormal Activity 3' trailer

New Delhi: After the first two parts of the movie scared audiences in multiplexes and home videos alike, the franchise is set to get you screaming with the third installment.

Part three promises to reveal the secrets and claims to be the scariest of all the three parts.

As much as the trailer reveals - the movie will explain why Katie was haunted by the demon. Katie had claimed in the first movie that a ghostly presence had haunted her since her childhood and believes that it has followed her to their new home.The first part of the movie involved the supernatural evil that Katie and her boyfriend Micah faced in their house, leading to Micah's death.

Part three promises to reveal the secrets and claims to be the scariest of all the three parts.

The second part of the movie saw the strange incidents happening in Kristie's (Katie's sister)house and at the end of the movie - Kristie and Dan are both killed and Katie walks away with their son Hunter.

21st October will reveal the rest of the secrets.

(For updates you can share with your friends, follow IBNLive on Facebook, Twitter, Google+ and Pinterest)