Whose Alibi Falls Apart?

The case file

Between 5:15 PM and 5:45 PM, the library's after-hours motion sensor fired -- and a laptop was swiped from a library cubicle. Four people were nearby that evening. Whose alibi falls apart?

The rule: All four findings come from verified records -- logs, cameras, receipts. Exactly one suspect's story contradicts the evidence.

The clues

1. Sam Okafor: The keycard log shows Sam Okafor badging into north garage at 5:08 PM. Phone tower records place Sam Okafor near north garage at 5:52 PM.
2. Felix Grant: The register tape shows Felix Grant ringing up a sale at the mall at 5:03 PM. A camera at riverside park recorded Felix Grant at 5:49 PM.
3. Dana Wren: A camera at riverside park recorded Dana Wren at 5:31 PM. The toll transponder on Dana Wren's car pinged at river toll plaza at 5:37 PM.
4. Hugo Bain: Phone tower records place Hugo Bain near riverside park at 5:00 PM. The toll transponder on Hugo Bain's car pinged at river toll plaza at 5:54 PM.

Who did it?

1. Felix Grant
2. Hugo Bain
3. Sam Okafor
4. Dana Wren

The verdict is still sealed. The answer is revealed here tomorrow — or play today's case and render your own verdict now.