betrayal

• Kiss of death

  An action or event that, despite appearing innocuous or even beneficial, inevitably leads to the downfall, failure, or demise of a person, project, or situation.

• Thirty pieces of silver

  A payment, often paltry, received for an act of betrayal or disloyalty.

• The serpent in the garden

  An insidious or hidden source of danger, temptation, or betrayal within an otherwise peaceful and idyllic setting.