A more detailed account here.
The characters learn the location of Yussuf's haven from Sabine's sire Abdullah, an enigmatic man who runs a luxury wares shop in the Armenian Quarter. Largely oblivious to Kindred ways, the characters will surely have to repay Abdullah for this information in the future.
While investigating Yussuf's home, the characters are ambushed by other Kindred; europeans posing as Ashirra, possibly Assamite. Isabeau intervenes and disappears again into the night.
A few nights later the PCs are stopped by Aram and his goons, hooded and taken through deceptive means to an Ashirra underground lair. Here they meet Suleiman, leader of the remaining Ashirra in Jerusalem, who questions them about their break-in in the home of Yussuf, who is missing.
The characters try to convince the Ashirra that a third party is trying to stir up a conflict between the groups through Felix's and Yussuf's friendship. Although threatening but civil, the Ashirra become somewhat more respectful when they learn that Aziz is the childe of Kadir of whom they have heard great things. The characters are sent on their way.
Anton is told the very same suspicion yet a few nights later, when the PCs deliver the news that both Felix and Yussuf have met their Final Deaths. No mention of a meeting with Ashirra is made. Although concerned, the seneschal allows for the characters to meet Maria, a Kindred scholar of the jewish faith, as promised. With her and possibly her sire's help the ancient hebrew scroll may be decyphered. It is soon evident however that the translation will take quite some time.
A year passes.