This spy kit includes 10 hands-on experiments designed to engage young investigators in solving the mystery of stolen gems. Activities involve decoding hidden messages using color-filter lenses, fingerprint analysis, constructing a periscope, creating key imprints with clay, and operating a cipher wheel. The set guides users through a structured investigation with clue cards and envelopes to track down a fictional treasure thief. The kit promotes analytical thinking through role-play and problem-solving exercises, with a detailed instruction manual providing step-by-step case-solving guidance. It can be used individually or as a collaborative group activity for parties or play sessions. Included components: measuring cup, three markers (dark blue, dark purple, red), blacklight pen, pipette, wood chisel, mini notepad (4.5 x 6.5 inches), stamp pad, air-dry clay, pH chart, 15 pH test strips, chromatography paper, secret message viewer, two plastic mirrors, concave plastic piece, treasure chest (4.25 x 1.5 x 3 inches), decoder wheel, periscope, seven clue cards with envelopes, and an instruction manual.