The thief is the man in the middle.

Clue:

He’s wearing sunglasses indoors while eating, which is suspicious behavior and might suggest he’s trying to hide his identity. Also, his outfit (a formal suit and glasses) seems like an over-disguise rather than natural attire for a casual meal. The other two appear more relaxed and normal for the setting.

The image hints at this subtle oddity—a thief might try to avoid recognition, and that’s exactly what sunglasses indoors suggest.

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