The Fingerprint Game on the Combination Lock

Jiang Xu and Xia Wan reunited beside a corpse locked inside a sealed room.

A former forensic investigation specialist, Jiang Xu immediately spotted the key detail: the smart keypad lock on the bolted door bore only the fingerprints of the victim and Xia Wan. But Xia Wan had a perfect alibi, making her fingerprint a “game marker” deliberately left behind by the killer.

The murders that followed all had the same pattern: each crime scene featured a strange fingerprint sticker on the keypad lock, and every fingerprint belonged to someone connected to an unsolved case from ten years ago. Jiang Xu used his technical expertise to crack the locks, while Xia Wan reconstructed the killer’s psychology through profiling. But whenever they came close to the truth, another “fingerprint suspect” died.

When the evidence box from ten years ago was opened, the fingerprint on the keypad lock at the bottom matched the killer’s exactly. Was this deadly game, with fingerprints as its pieces, an act of revenge or a frame-up? Jiang Xu stared at the old scar on Xia Wan’s palm and suddenly realized they had been caught in the game all along.