The Nicki Holland Mysteries Books in Order

Vandalism, a missing dog, and stolen school papers trouble Pine Grove, where mysterious marks seem to connect the incidents. Nicki and her friends investigate as suspicion falls on Kim, a new student facing unfair assumptions.

Nicki and her friends become involved when elderly Lela Greaves faces the loss of everything she owns. With little information to guide them, the girls pursue a puzzling clue and try to help their vulnerable friend.

Christine's older brother Tommy begins behaving violently, alarming the girls who know him. Nicki and her friends investigate his disturbing change, trying to understand what is happening before his increasingly dangerous behavior causes further harm.

Nicki accidentally picks up the wrong suitcase at an airport and discovers bundles of hundred-dollar bills inside. The unexpected contents draw her and her friends into a mystery surrounding the money and its rightful owner.

While helping at Meredith's uncle's bowling alley, Nicki and her friends encounter sudden darkness and an apparent ghost near lane thirteen. They investigate the unsettling events as they try to protect the family's struggling business.

Track star Jeremy Newkirk is frightened of dogs, and someone appears determined to exploit that fear before an important race. Nicki and her friends investigate threatening messages and calls while the competition deadline draws closer.

A London holiday becomes a mystery when Laura's diamond birthday bracelet disappears. Nicki and her friends search for the missing jewelry, finding that their sightseeing plans have led them into a potentially dangerous investigation instead.

On a flight to Ireland, Laura agrees to watch a woman's baby, but the mother never boards. Nicki and her friends have only hours to determine whether the child has been abandoned or taken.

An invitation to an ancient Irish castle introduces Nicki and her friends to legends of hidden treasure. Strange events and frightening local stories leave the girls trying to separate a genuine mystery from superstition.