A writer is developing a story in which it is not clear at first who is good and who is bad. Which narrator would work best for this situation?

Using a first-person narrator is tricky and should be attempted only by the most experienced hand. In-house editors know this, which is why they no doubt cringed when they saw the opening chapter of my new release The Cat Lady’s Secret. Not only is it in first-person, it’s in present tense. To make matters worse (to make those poor souls snatch themselves baldheaded) the second scene is in third-person, past tense.