A huge newspaper-publishing company receives a threatening letter about a soon explosion. Against the will of the leaders, Inspector Jensen evacuates the building.

A huge newspaper-publishing company receives a threatening letter about a soon explosion. Against the will of the leaders, Inspector Jensen evacuates the building. Despite there is no explosion an investigation begins, led by Jensen. Soon he learns that the company has a great number of enemies, but seems he is on the right track to find the delinquent. On the next day his boss wants to stop him, since the company found the offender.—mrtanaka