Vigilance

Vigilance (警戒, Koshi) is the thirty-fourth episode of the Death Note anime series.

Synopsis
Shuichi Aizawa uses a trick to see through Light Yagami's deception and discovers the truth about him. Later, the SPK takes Misa Amane and Kanzo Mogi into custody. This is all a part of Near's plan to expose Light as Kira.