dungeons and dragons – What is the name of this book with an adventure on the backside?

I’m trying to find a book again that I had decades ago. It was a book for the dragonlance setting. It had a map on the backside with the city and the inn from the first novel and the surrounding area. On the map was also a location for a vampire mansion and inside the book were details on the mansion, the vampire and also infos about the different cast members from the book (including background infos).

All in all the book allowed one to play adventures just before the 1st novel was set.

Can someone tell me the name of the book?