San Francisco detective Lindsay Boxer has only the cryptic message written in lipstick on a car windshield as evidence from the brutal shooting of a mother and her child as they were returning to their car in a mall parking garage, and things become complicated when an empty safe is discovered along with the body of an popular actor.

Pierre, who lives alone at the foot of a mountain, hops in his car one day in search of a friend, and meets Goat, Sheep, and Bear along the way.

While traveling in London, Paris, and Amsterdam, fourteen-year-old best friends Kari and Lucas solve an international art forgery mystery.

While trying to reconnect with her friend Tom, who has returned to the United States without leaving a forwarding address, eight-year-old Rose inadvertently discovers the identity of her adopted sister Saffy's father.

Olivia Sharp is good at uncovering secrets, and discovers several when on a trip to Carmel, California to help a friend become a member of an exclusive club.

Margo Sullivan, the daughter of the stern housekeeper for the wealthy Templeton family, sets out to win fame and fortune on her own terms, but when disaster strikes, she returns home to find Joshua Templeton waiting to see if she will make his childhood dreams of love come true.

Jess knows her summer plans are ruined but little could she imagine the huge surprise that awaits her when she visits her dad's home for the first time in years.

Charlotte goes to Paris to visit her friend Sophie and to bring her cat back home.

"Almost-eight-year-old" Ruby Lu spends time with her baby brother, goes to Chinese school, performs magic tricks and learns to drive, and has adventures with both old and new friends.

Mouse hears a rumor that snakes do not like mice; and while trying to avoid his former friend, Snake, he falls into a hole from which neither Hedgehog, Squirrel, nor Rabbit can help him out.