This is one of the quests where your task will be to find a way to restore the destroyed shrine. To start this specific quest, you must approach the "Prince's Crossing" shrine.
I stumbled upon a desecrated Christian shrine near Prince's Crossing. Who is responsible?

1. Investigate the shrine
I noticed a lonely Christian shrine... but something is amiss. I should take a closer look.
Approach the shrine and inspect it to realize that its heart is missing.

2. Search for clues around the shrine using Focus Mode
Someone has desecrated the shrine and stolen its heart - typically a saint's figurine. I should take a look around, maybe the culprit left some tracks.
Examine the footprints on the ground right next to the shrine.

3. Follow the tracks
The thief was careless and left some tracks behind. I should follow them if I want to reclaim the shrine's heart.
Follow the tracks. First head north along the road, then turn right into the forest. They will lead you to a clearing where you will find the bodies of a few people and four wolves.

4. Search the area using Focus Mode
I found the thieves... or what was left of them after they encountered a pack of wolves. Still, I hope the shrine's heart is somewhere around here.
Examine the bodies lying in the clearing. In one of them, you will find the missing heart of the shrine - Prince's Crossing Shrine's Heart.

5. Restore the shrine (1 Time Segment)
I reclaimed the shrine's heart. Only thing left to do is return to the shrine and restore it.
Return to the shrine and put its heart back where it belongs.

6. Ending
A group of people took the shrine's heart to please Knyaz Brencis... only to run into a pack of hungry wolves. Divine punishment? Either way, I was able to reclaim the heart and restore the shrine to its former glory.