From publisher blurb:
This adventure supplement is a special collaboration with another creator we feel fortunate to call a friend, Tom Cartos. In Frostbitten to Death, a group of level-7 adventurers travels to Frostpeak, one of the largest northern cities, and the capital of the White Horizon territories. They may be hired to investigate a series of murders in the city's surroundings or get involved in these crimes on their way to the capital. Their decisions will dictate how this adventure ends and who gets to live or not!
The culprit for the recent attacks on travelers and merchants is Rivnar, the king's son. In a horrible turn of events, he froze to death in the tundra after failing to track some orcs that raided Frostpeak citizens... The heroes may be aware of the prince's death, but they have no way of knowing he is the murderer behind the crime scenes...
This is a level 7 adventure that takes the heroes to an underground, ancient duergar crypt. There, they must confront the frozen prince and the undead he woke. Perhaps, there is still hope for the prince's soul to find peace in the afterlife.