A disappeared corpse causes a variation on murder in the inimitable Dekok's new case. As has been her habit since the death of her husband, Mrs. Hasbergen does nightly rounds in the large office building where she resides. Her husband had been the building superintendent, and an apartment on the top floor came with the job. Having picked up some of her late husband's duties, the president of the company has let her stay in the apartment. During one of her nightly tours, she encounters Mr. Vredenburg, President of the Dredging Company, in the boardroom, sitting in his large chair at the head of the table. She hastily walks up to him... only to find him dead. With the switchboard closed at night, Mrs. Hasbergen rushes up to her apartment to call someone, but who? The police? The doctor? Deciding it better to return to the boardroom to examine exactly what happened to Mr Vredenburg, she finds the corpse disappeared. Wrought with worry and confusion, Mrs. Hasbergen learns from one of the secretaries that Mr. Vredenburg has left for a vacation in the Bahamas. Dumbfounded, she can't stand the burden of the night any longer and turns to Inspector DeKok to enlist his help in discovering what happened to Mr. Vredenburg.