Jam, a brilliant young detective with an uncanny ability to solve cases, finds herself in an unusual predicament when she arrives at a sprawling, eerie estate shrouded in mystery. While her deductive prowess has already led her to identify the culprit responsible for the disturbance, the nature of the actual crime itself remains frustratingly obscure. Forced to work backward from her conclusions, Jam must navigate the mansion's shadowy corridors and uncover the truth behind the incident, piecing together clues that will finally reveal what truly transpired within those walls.