Book 3

Christine's friends help her investigate the cause of her older brother's increasingly violent behavior after witnessing his frightening outbursts.

Book 5

Nicki is plunged into another mystery when she accidentally takes the wrong suitcase from the airport and finds it filled with bundles of hundred dollar bills.

Book 6

Nicki and her friends try to find out who is behind the mysterious occurrences at the small local bowling alley.

Book 7


Book 8

Nicki and her friends travel to Ireland where they find themselves searching for a legendary treasure that will make it possible for their hosts to keep Cravenhill Castle.

Book 9


Nicki is determined to solve the mystery at Pine Grove Middle School when a student's research paper is stolen and circumstantial evidence points to her new friend Kim, a Korean American.