A hist at your local museum had gotten wrong and the stolen goods got scattered and hidden somewhere around.
The museum is promising a reward for every returned artifact and you are one of the lucky few that has stumbled upon one of them.

While you where walking home drunk from a party, you decided to take a shortcut through the woods, just to step accidentally step into a hole and injury your foot at a sharp object piercing through your shoe.

This sharp object was the ear of a golden figure displaying the cat goddess Bastet, that you then took home with you.
You paced it on your nightstand, already eager to collect the reward money the next day and got to bed.
Little did you know, what consequences, your little blood sacrifice on that figure, will await you in the morning.