18. The Christmas Tree Farm

1. Step 1

   1. Carl was sitting on a sled.
   2. He is a worker, so he is in Patch 1, Patch 2 or Patch 3.
   3. Their sleds are on C1, D1 and B3.
   4. Bob was one row above Carl, so Carl can't be in row 1.
   5. So, Carl is on B3.

2. Step 2

   1. Bob was exactly one row above Carl.
   2. Bob is a visitor, so he is not in Patch 1, Patch 2 or Patch 3.
   3. So, Bob is either on A2, E2, F2 or G2, in row 2.

3. Step 3

   1. Row 7 needs someone.
   2. Angus was in Patch 3, so he is in column D, and D7 is in his column.
   3. So someone is on G7, and that blocks column G.
   4. Floyd was sitting on a sled.
   5. He is a visitor, so his sled is either F1, E2 or G4.
   6. Bob is blocking row 2, and G4 is in column G.
   7. So, Floyd is on F1.

4. Step 4

   1. Angus was in Patch 3.
   2. Floyd is blocking D1, and Carl is blocking D3.
   3. So, Angus is on D4.

5. Step 5

   1. Dulcie was beside a sled or the stove.
   2. She is a visitor, so she is not in Patch 1, Patch 2 or Patch 3.
   3. Outside them, the squares beside a sled or the stove are E1, E3, F2, G3, F6 and G7.
   4. Bob and Carl are blocking rows 2 and 3, and Floyd is blocking E1 and F6.
   5. So, Dulcie is on G7.

6. Step 6

   1. Floyd and Dulcie are blocking F2 and G2, so Bob is either on A2 or E2.
   2. Let's assume Bob is on E2, and test it.
   3. Bob would be in Patch 4, so nobody else would be in the Field or the Barn.
   4. Vera and Emily would take rows 5 and 6, in columns A and C.
   5. The snowman is on A5, so one would be on A6, in the Barn.
   6. The other would be on C5, in the Field.
   7. Then Vera would be alone in her area, but she was with exactly one other person.
   8. So that test fails, and Bob is on A2.
   9. So, Bob is on A2, in the Field.

7. Step 7

   1. Vera and Emily take rows 5 and 6, in columns C and E.
   2. So they are either on C5 and E6, or on C6 and E5.
   3. C5 and E6 are both in the Field, with Bob.
   4. Then Vera's area would hold three people, but it held exactly two.
   5. So they are on C6 and E5.
   6. C6 is in the Barn, where nobody else is.
   7. Vera wasn't alone, so she is on E5, in the Field with Bob.
   8. That leaves C6 for Emily.
   9. So, Vera is on E5, and Emily is on C6.

8. The answer

   1. Vera was on E5, alone in the Field with Bob.
   2. Bob is the murderer!

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