In >>Farewell, My Lovely<<, a classic mystery written by Raymond Chandler, the third paragraph begins with a description that is in the classic form for this genre:

>>It was a warm day, almost the end of March, and I stood outside the barber shop looking up at the jutting neon sign of a second floor dine and dice emporium called Florian's.<<

This is the voice of Philip Marlowe speaking, as he does throughout the novel. First-person mysteries allow the reader a better chance to solve the crime along with the detective, in my opinion. There is a shared journey of discovery of the clues, rather than the glimpses of them provided by an omniscient narrator.