The Paper Trail

The case file

Someone entered the downtown office after hours. The logs below are all verified -- the order has to be reconstructed. What happened first?

The rule: Every finding below comes from a verified log. Reconstruct the order of events.

The clues

1. The door sensor log shows the side door sensor tripping at 9:45 PM, after the server-room motion sensor firing.
2. The phone log shows the security check-in call being logged at 9:56 PM, after the side door sensor tripping.
3. The alarm log shows the alarm tripping at 9:53 PM, after the side door sensor tripping.
4. The camera log shows the lobby camera flagging motion at 9:58 PM, after the side door sensor tripping.

Who did it?

1. the alarm tripping
2. the lobby camera flagging motion
3. the side door sensor tripping
4. the server-room motion sensor firing

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