The story of Salah ad-Din's expansion from Egypt back into Syria, his brushes with Rashid ad-Din Sinan's Assassins, his constant lobbying of the Abbasid caliph in Baghdad, his struggles with the Zengid remnants and with a cast of enemies among the crusader states including Baldwin the Leper, Reynold de Chatillon, Raymond of Tripoli, and King Amalric of Jerusalem.
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Sources:
Cobb, Paul, M. The Race for Paradise: An Islamic History of the Crusades. Oxford University Press, 2016.
Lēv, Yaacov. Saladin in Egypt. Brill, 1999.
Lyons, Malcolm Cameron & Jackson, D.E.P. Saladin: The Politics of the Holy War. Cambridge University Press, 1982.
Man, John. Saladin: The Life, the Legend, and the Islamic Empire. Bantam Press, 2015.
Mirza, Nasseh Ahmad. Syrian Ismailism: The Ever Living Line of the Imamate, AD 1100-1260. Psychology Press, 1997.
Waterson, James. The Ismaili Assassins: A History of Medieval Murder. Frontline Books, 2008.