Hi,

I'm in Venice and was at the bit where two assassins fight the persian I was supposed to meet at night. When it went into fighting I killed one assassin, but the other one (with the key) disappeared.

I haven't got any earlier game saves since I saved over my files before realising one of them was supposed to have a key. Is there any way I can rectify this as I don't want to have to go through the whole experience up until this point again.