Progressive help · no full solution

Northbound: spoiler-light hints

Open these in order. Each hint narrows the evidence chain without naming the culprit or the final answer.

  1. Hint 1
    Reveal hint 1

    Track the phone and Lina as separate travellers from the first unexplained stop.

  2. Hint 2
    Reveal hint 2

    A locked berth proves where an object stayed, not where a person stayed.

  3. Hint 3
    Reveal hint 3

    Use repeated station loops and prepared evidence to identify the safe exit plan.

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