The Ruins of Rackfall is an adventure for four to six 7th-level characters. From the back cover:

Alistene Krineweld has disappeared.

The authorities of the city of Ragmoran have arrested her husband for her murder, even though he maintains she was kidnapped. For Benesh Krineweld is both a moneylender and an elf, and for a man with as many enemies as he has, there is no justice.

Unless a group of adventurers can be found to do what no one else is willing to do — brave the ruins at the source of Rackfall River, rescue Alistene from her kidnappers, and probe Benesh's innocence — he will be executed for a murder he did not commit.