Put on your investigators hat and follow the clues to solve mysteries. Each mystery themes — from a time traveler's abandoned trunk to an escaped creature, a coded star map, and an impossible invention — unfolds across three sessions of evidence, contradiction, and reveal. Students keep a physical detective dossier for each case and practice the same skill scientists, engineers, and historians use: forming a hypothesis, testing it against new evidence, and revising when the evidence demands it. Can you solve it?