Jane, the heroine of Office Mystery, works as a secretary and assistant in the office of John, the owner of the company. This couple worked together very well, which is very important for the work of the company. But lately strange things have been happening in the office. For several days in a row, documents have been disappearing from the desktops and Jane intended to sound the alarm, but the loss appeared again, moreover, in its place. But when once again this happened and the documents were not returned, the heroine was alarmed and informed the boss. Unfounded suspicions heat up the office, so Jane and several employees decide to ambush and find out the identity of the intruder in the Office Mystery.