Father Braun is transferred as curate in Potsdam's St. Cassian parish. Local rabbi Chaijm Seelig is absurdly the prime suspect of the blunt murder of a gentile gardener whose corpse is found in the synagogue. The victim's firm Kruschke bitterly rivals Jewish colleague Adam Grün's but secretly worked on re-breeding a priceless extinct black tulip, which ties to a Dutch murder. Discovering heirs from the rival families, both after the monumental Sansouci royal palace garden contract, have secretly fallen in love, priest and rabbi support such reconciliation key, yet bicker about their religion's incompatible claims to marriage and offspring.