Vampire power of the snake

Exploration Stage: Japanese Garden
From: Cardsharp
Description: You're helping the detective avoid becoming a vampire, aren't you? He should have protected his eyes first. ........ What do you mean by "why?" Vampires stare and hypnotize. Just like snakes! The vampire's power must absolutely come from the snake. By the way, I recently saw a pair of snake monocle glasses! Look for it!
Completed: Don't give me the snake's one eyeglass. Take it to Martha immediately. She'll find out why the vampire is using his power to influence his friends. I'd better get going.