Successful lab entrepreneur Dietmar Hüttner is killed on the construction site of his new home the night after the completion party. Widow Anna Hüttner makes a logical suspect as heir with hiding her marital troubles and affair with carpenter Frank Hennenberger, whose alibi proves fake. Frank's boss, contractor Peter Kastl, was overhear by polisher Achim Maibach, secretly arguing with Dietmar about an inverse claim.
—KGF Vissers