"While staying in the quant rual town of Keswig, the PCs are approached by a troubled young woman named Elexa Justheart. Elexa has just returned from the Galhanor Crusades--a war fought against giants and humanoids in the distant Galhanor Mountains. After serving six months as a cleric in a series of major battles, she recently arrived home to find her uncle's castle occupied by evil brigands." -- from the module. Includes overland maps and maps of the tower and castle.
The PCs are singled out by happenstance as prophesied heroes who will find and return a great wizard to his family. Once brought back to the the family chateau, they are brought on as paid companions and free to explore the location as they wish. This is a large sandbox style adventure with several plots going on, including assassination, a wedding, false accusations of murder, and many machinations of the nobles to solidify or gain power. Whole this is going on the PCs are dropped into dream sequences where they learn more about the missing wizard and learn how and where to find and free him
Trapped in the mysterious Castle Amber, you find yourselves cut off from the world you know. The castle is fraught with peril. Members of the strange Amber family, some insane, some merely deadly, lurk around every corner. Somewhere in the castle is the key to your escape, but can you survive long enough to find it? TSR 9051