When a couple falls in love with an orphaned kitten at the veterinary clinic, they adopt her, name her Sweetheart, and take her home to become part of the family. A dangerous and poisonous snake lhat likes to frighten and bully other animals lives at a nearby lake. When the snake sneaks into the house through a gap in the door and surprises sleeping Sweetheart, she springs into action to prove her bravery and love for her family. Educational materials are included after the story.