When her history teacher begins receiving death threats and her own name is near the top of the suspect list, eighth-grader Sammy is determined to find the real perpetrator, but she is distracted by her mother's relationship problems, her almost-boyfriend inexplicably avoiding her, and her duties as a reluctant bridesmaid.

When the diabolical Damien Black robs a bank and steals a tiger-eye of great sentimental value, he is pursued by thirteen-year-old Dave Sanchez and his sidekick, a talking gecko named Sticky, who are armed with a magical Aztec armband.

Thirteen-year-old Dave and Sticky, his kleptomaniac sidekick gecko, try to keep a special potion from falling into the hands of the diabolical Damien Black.

Seventh-grader Dave Sanchez and his talking gecko sidekick Sticky decide they must rescue an odious science teacher who has been kidnapped by the even more villanous Damien Black, who is masquerading as a substitute teacher in order to steal Dave's magicAztec armband.