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Case 50: who took the Giant Pearl?
The alarm at the aquarium went off for no apparent reason for the third time this month, so almost no one paid attention. That was a mistake: this time the Giant Pearl, kept in the Maintenance Room, really was missing. Help the police unmask the thief, who clearly knew exactly when no one checks the cameras.
The board
- 1Reception Area
- 2Lobby
- 3Diving Room
- 4Children's Room
- 5Storage Room
- 6Maintenance Room
- 7Main Aquarium
- 8Tank Room
- 9Laboratory
- 10Office
- 11Gift Shop
- 12Café
- Plant: no character can stand on its cell, but the stolen item can be there.
- Seat: anyone can be on it.
- Shelf: no character can stand on its cell, but the stolen item can be there.
- Table: nothing can be on its cell.
- Screen: nothing can be on its cell.
Suspects and clues
- NNadia
She's 7 rows away from the Laboratory and 6 columns away from the Gift Shop. - DDana
She's in column D and 1 row away from the Storage Room. - CChidi
He's in column G. - BBoris
He's right next to the Diving Room. - MMartha
She's 5 columns away from the Diving Room. - LLiu
He's in the Café. - SSven
He's in row 5. - EElena
She's 5 columns away from the Café. - GGiant Pearl (stolen item)
It's 4 columns away from the Main Aquarium and 3 rows away from the Tank Room.
Remember the rules: no two suspects (nor the item) ever share a row or a column, each character is in a different room, and the thief is the only one sharing a room with the stolen item. Unsure? Read how to play and the clue types.
Solution
Try it yourself first: pen and paper are enough. When you want to check, open the reasoned solution.
Show the step-by-step solution
- Nadia's clue: She's 7 rows away from the Laboratory and 6 columns away from the Gift Shop. It leaves a single cell: I10.
- Dana's clue: She's in column D and 1 row away from the Storage Room. It leaves a single cell: D8.
- Chidi's clue: He's in column G. 11 cells remain possible.
- Boris's clue: He's right next to the Diving Room. 8 cells remain possible.
- Martha's clue: She's 5 columns away from the Diving Room. It leaves a single cell: B4.
- Liu's clue: He's in the Café. 3 cells remain possible: J1, K1 and K2.
- Sven's clue: He's in row 5. 10 cells remain possible.
- Elena's clue: She's 5 columns away from the Café. 2 cells remain possible: E1 and F2.
- The stolen item's clue: It's 4 columns away from the Main Aquarium and 3 rows away from the Tank Room. It leaves a single cell: K11.
- Nadia can only be on I10. No one else can be in row 10 or column I, and no other character can be in the Reception Area.
- Dana can only be on D8. No one else can be in row 8 or column D, and no other character can be in the Maintenance Room.
- Martha can only be on B4. No one else can be in row 4 or column B, and no other character can be in the Children's Room.
- The Giant Pearl can only be on K11. No one else can be in row 11 or column K.
- K1 and K2 have already been ruled out, so Liu can only be on J1. No one else can be in row 1 or column J, and no other character can be in the Café.
- E1 has already been ruled out, so Elena can only be on F2. No one else can be in row 2 or column F, and no other character can be in the Office.
- Every cell still open to Chidi is in column G, so no one else can be in that column.
- Every cell still open to Boris is in column H, so no one else can be in that column.
- Every other cell the clue allowed has already been ruled out, so Sven can only be on E5. No one else can be in row 5 or column E, and no other character can be in the Lobby.
- Every other cell the clue allowed has already been ruled out, so Chidi can only be on G12.
- G3, F4, G4, H4, I4, G5 and H5 have already been ruled out, so Boris can only be on H3.
Conclusion: Nadia is the only person sharing the Reception Area with the Giant Pearl, which is on K11. She is the thief.