This quest can be acquired from Andrew, the innkeeper at the Inn in the Glade. He has heard rumours that the tavern in Skalitz was looted by thieves. He recommends that you speak with a Skalitz refugee named Adam, who can be found somewhere in Rattay. Go to Rattay and ask one of the refugees where he might be. Those who definitely know are Alex and Ringlet.
Once you know that Adam will be either at the stables or in the tavern, a marker with his location will appear on the map. Find him and speak with him.
Once you have found out everything you can from Adam, you will have two options; inform Andrew the innkeeper about what you have learnt, or take the valuables directly back to Adam. Whatever you choose, you will first have to find the charcoal-burner north of Rovna.
You can choose to intimidate the charcoal-burner to make him admit everything, or you can take a softer approach leading to the option of purchasing the loot. If you intimidate him successfully he will tell you that you can find the stash under a fallen tree in thw woods. Go to the tree and retrieve the loot. You can now go back to the charcoal-burner and ask him about where the cross is. He will tell you that he sold it to Andrew, the innkeeper at the Inn in the Glade.
If you plan to give everything back to Adam, you should ask Andrew if you can buy the cross from him. He will accept, and you can haggle the price. You can now take everything back to Adam and choose no reward, a small one, or a large one. Alternatively you can tell Adam that you found the loot and split the reward, earning you 575 Groschen. Regardless of your choice, the quest will then complete.