Tale of 2 Kingdoms; Evil ending?

[groenewegendavid]

I am wondering how to get the evil ending for Tale of 2 Kingdoms?
I have tried to talk to the thief after robbing the jewel-shop and using the truth gem
as well,
it does nothing. No evil ending

[Radiant]

You should

Spoiler

show the truth gem to the assassin

[close]

Spoiler

Needless to say, this only works if you know who the assassin actually is.

[close]

Spoiler

It's not Ruadh.

[close]

[Dave]

Hey, but WHO is the assasin?
and what was the motive?

Thanks.

[Radiant]

Ah, but that would be telling!

Try Sherlocking, and see what you come up with.