A bag of cat treats.
The back of the bag: as you can see, the bag was ripped apart and only a few crumbles were left behind. Further forensic analysis might be needed to uncover the culprit.
The main suspects:
Froufrou... (whom, in my opinion, looks guilty as hell)
...and Stella. (A little upset that I woke her up.)
The suspects have decided to remain silent until an attorney of their choice can speak in their defense. Very suspicious indeed.
Update: Yup! It was Froufrou alright! Sorry Froufrou, no more treats until I do the groceries, because someone ate them all already.