In L's case, Light came out a genius plan by having himself lost memory and regain it, and then made Remu killed L. IMO, it was a very genius plan and I couldn't see it happened.
However, in N's case,
Spoiler:
ever since I read that one of N's guy managed to find Mikami's note, I predicted that he was gonna swap it...and I was right. And Light lost because of this....NOOOOOO!!!!
I haven't read this chapter...so i want to ask that, if Light really was arrested or he escaped? If he escaped maybe we will enter third arc, Light's counterattack!!!