Right Before

The case file

Someone entered the clinic after closing. The logs below are all verified -- the order has to be reconstructed. Which event happened immediately before the records-room motion sensor firing?

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

The clues

1. The sensor log shows the records-room motion sensor firing at 7:31 PM, after the hallway camera flagging motion.
2. The phone log shows the cleaning crew's check-in call being logged at 8:23 PM, after the front-door keycard reader logging an entry.
3. The door sensor log shows the side-door sensor tripping at 7:41 PM, before the front-door keycard reader logging an entry.
4. The alarm log shows the alarm tripping at 8:29 PM, after the hallway camera flagging motion.

Who did it?

1. the alarm tripping
2. the hallway camera flagging motion
3. the front-door keycard reader logging an entry
4. the cleaning crew's check-in call being logged

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