When Molly and her friends form the Secret Society of the Left Hand, each member agrees to do a secret act of kindness, but when someone threatens to reveal the secrets, Molly must find the traitor before suspicion tears the group apart.
When the tagalong member of their club disappears, Molly and the other members begin a search which gets scary and causes them to question their responsibility in the matter.
During the excitement of her school's mock election, as she is serving as campaign manager for her friends Sunny and Quentin, Molly tries to discover who is framing her for horrible practical jokes connected to the campaign.
The mysterious behavior of Sunny Miller, a Korean adopted into an American family in Cinnamon Lake, involves Molly and the gang in a case of bug burglars, stage fright, and Jesus' love.
When they are asked to work in the church soup kitchen, Molly and the other Cinnamon Lakers are drawn into a mystery surrounding missing funds and they learn that appearances can sometimes be deceiving.