This mystery can be found in the north of Lincolnscire, just west of Grimsby.
When you arrive at the scene you’ll find a woman weeping near a shrine. It sounds like she’s recently lost someone important to her, but when you speak with her you’ll soon learn that she lost her beloved cat, Sphinxy, eleven years ago. The shrine is unfinished, and she can’t bring herself to sort through Sphinxy’s things and complete it alone. You’ll need to offer a helping hand if you want to complete the mystery.
Once you’ve offered to help sort through Sphinxy’s things, enter the house and shoot through the boxes to get inside. You can use Odin’s Sight to highlight a bowl, a bone, and a blanket. You’ll need to shoot through some more baskets and move a barricade to access each item, but once you have all three you can return to the woman outside. She’ll walk over to the shrine and you can place the belongings next to it. All that remains is to speak with the woman to complete the mystery.