Death Note Fan Fiction: Are You Sure You're Not Kira?

Something has been bothering L lately. It's not the fact that Watari always runs out of cake in the refrigerator, or that Mello's physical appearance reminds L of a girl, or even the fact that Near always seems to force L to play tea party with his toys. No, it's not that. It's something different. Apparently, news report that there is a mysterious serial killer roaming in Japan. As the best detective in Japan, it is up to L to solve this "Kira" case. But how would he handle it when his mind is filled with doubt and second thoughts? And most importantly, how would L handle Kira when the time comes?