Its a mystery
The best mystery I ever read was probably "This Book is Not Good For You." The reason this the best is because it real suspensful and creepy.
If I was writing a story I think a good start to one would be... I was on a walk one night in New York regular ruteen of mine. Somtimes I would see cops on potrol but nothing to spectacular untill today... and that i think would be a good start to a mystery.