Brain traning (The Case of the Missing History Book)

Sherlock Holmes is called to investigate a curious case at Baker Street High School. A history teacher, Ms. Adler, discovers that her prized history book, a first edition signed by the author, has gone missing from her classroom. Three students were the last to leave the room before the book disappeared: Emma, Jake, and Liam. Sherlock enlists you, his young detective-in-training, to solve the mystery.

Clues

1. Emma says:"I left the classroom right after Jake, but I didn’t touch the book. I was busy picking up my notes."

2. Jake says:"I saw Liam looking at the book when I left, but I didn’t stay long. I had soccer practice to get to."

3. Liam says:"I did look at the book for a second, but I didn’t take it. Jake was still in the room when I left."

4. The security camera near the classroom shows:

   • Jake leaving at 3:10 PM.

   • Emma leaving at 3:12 PM.

   • Liam leaving at 3:09 PM.

5. Ms. Adler remembers seeing her book at 3:05 PM when she left the classroom for a meeting.

Your Task

Using the clues and the statements, determine:

1. Who is lying?

2. Who most likely took the book?

3. What logical reasoning supports your conclusion?

Hint for Investigation

Pay attention to the timeline and the contradictions in the students’ statements. Compare the security footage with what they claimed! Sherlock believes the truth lies in the details.

Good luck, detective! 🕵️‍♂️

Answer below.

Solution to the Case of the Missing History Book

Step 1: Organize the Evidence

• Timeline from the security camera:

  • Liam leaves at 3:09 PM.

  • Jake leaves at 3:10 PM.

  • Emma leaves at 3:12 PM.

• Teacher’s observation: The book was still there at 3:05 PM.

• Statements:

  • Emma: Left after Jake, didn’t touch the book, was picking up notes.

  • Jake: Left before Liam, didn’t stay long, had soccer practice.

  • Liam: Left first, looked at the book briefly, Jake was still in the room.

Step 2: Check for Contradictions

1. Liam’s statement:

   • Liam says he left first and Jake was still in the room.

   • This matches the security footage, where Liam leaves at 3:09 PM.

2. Jake’s statement:

   • Jake says Liam was looking at the book when Jake left.

   • This is impossible, as the footage shows Jake leaving after Liam (at 3:10 PM).

3. Emma’s statement:

   • Emma says she left after Jake and didn’t touch the book.

   • This matches the security footage, which shows Emma leaving last (at 3:12 PM).

Step 3: Identify the Liar

• Jake is lying.

  • His claim that Liam was still in the room when Jake left contradicts the timeline.

Step 4: Determine the Thief

• The timeline reveals the critical window:

  • The teacher saw the book at 3:05 PM.

  • The first person to leave was Liam at 3:09 PM, meaning the book was taken between 3:05 PM and 3:09 PM.

• Liam admitted to looking at the book and had the opportunity to take it before leaving.

• Jake’s lie suggests he may have been trying to shift suspicion onto Liam, but Jake had less opportunity (he left after Liam).

Conclusion

• The thief is Liam. He had the opportunity to take the book between 3:05 PM and 3:09 PM. His statement that he only "looked at the book for a second" was an attempt to downplay his involvement.

Final Answer

1. Who is lying? Jake is lying.

2. Who most likely took the book? Liam took the book.

3. Reasoning: Liam was the only person with time alone in the classroom while the book was still there. Jake’s false statement only adds to the confusion but does not align with the evidence.