Einstein Deduction #9
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The Case
A rare book was stolen from the locked study of a country mansion during a weekend gathering. Six guests stayed overnight in six rooms. The study's safe was opened without force. The host suspects one of the guests. Case file EINSTEIN-009.
Which guest stole the book?
Evidence (10)
#1The study door was locked from inside. The window was found unlocked, but no footprints were outside despite soft ground after rain.
#2The mansion has three hallways: A and B have security cameras, Hallway C (old servants' passage) does not.
#3The study is accessible only from Hallway C. Only rooms 4 (Pascal) and 5 (Vivian) connect to Hallway C.
#4The safe uses a 6-digit code and wasn't forced. Only the host knows it.
#5At dinner the evening before, the host opened the safe to show Vivian a family necklace stored inside.
#6Pascal reported hearing footsteps in Hallway C around 2 AM. Vivian said she slept through the night.
#7The other guests — Isadora (room 1), Thomas (room 2), Nadia (room 3), and Franz (room 6) — are all in rooms connected to Hallways A and B.
#8Camera footage from Hallways A and B shows no movement between midnight and 6 AM.
#9Vivian was seated next to the host and had a direct line of sight to the keypad when the safe was opened.
#10A rare book dealer in another city received an anonymous inquiry about the stolen book's title two days after the weekend.