Initial ideas

1) Horror/thriller. Girl is out walking dog but it runs ahead. Hears noise from inside the building and so walks through the gate, then around the building looking inside. Sees a shadow moving about inside and so cautiously approaches door calling out for the dog. Can see hooded figure rise behind her. Cuts to title slide

The shack

2) Film noir. Man receives phone call from friend saying “I need help, they’re coming for me. Meet me at a café in half an hour”. An hour later he turns up at the friend’s house. Finding his friend on the floor dead, he removes an envelope addressed to him from the pocket and leaves.

Billy Bob Thornton in The Man Who Wasn’t There