In the short story 'The Tell Tale Heart' by Edgar Allen Poe, the author has one objective in mind - to quickly grab the attention of the reader, scare and intrigue the reader's curiosity,and hold it there til the end. You might want to explore the idea of the effect of suspense. This is where the author suggests an idea or possibility (usually a scary or creepy one!) to a reader by building upon the intrigue little bit by little bit, layer on layer.
Look at how he does this from the very first sentence and make some essay notes line by line. Look out for deliberate little clues he gives the reader as to what might happen next, how he builds character so the reader sees personalities (weird ones in this case) develop. Look at the images, sounds and effects he uses to create atmosphere.
You should find lots - Poe was renowned for throwing every technique in his writing repertoire at it!