Nancy, Bess, and George follow the animal tracks of tigers that escaped from a van that was carrying them illegally.

Nancy Drew must protect an unstable super fuel-efficient engine, a creation that could possibly end the world's energy crisis, but along the train journey she and her friend George realize that their adversaries will destroy the train if they fail in stealing the engine.

Nancy, Bess, and George try to find the true heir of a fortune they found locked inside a safe on an old yacht.

When Ned is arrested for shoplifting and Nancy receives a mysterious bracelet in the mail, crimes are committed for each charm on the bracelet and Nancy, with the help of Bess and George, must find the culprit before Ned is convicted.

When Nancy Drew and Ned Nickerson attempt to return a lost dog to its owner in the small town of Nevershare, they stumble onto a much bigger mystery--the entire population of Nevershare is missing, except for one unhelpful woman.

When Hinkley builds a prototype for a new high-efficiency car, he asks Nancy and her mechanic Bess to drive it in a government-sponsored race in which the winner receives a government development contract, but someone is determined to keep Nancy and Bess from winning.

Tech gadgets are disappearing left and right at school, and Lunch Lady must get to the bottom of it.

When Nancy is pushed over a cliff while trying to find out who sabotaged a search for the rare tillybin plant, a potential cure for Alzheimer's, it is up to her friends Bess and George to save her and find the culprit.

When Jarvis is attacked by a troll, the Creeps are set to investigate, believing that the monsters may be behind Pumpkin County's gossip website, which spews out alarmist messages and misinformation, causing the entire town to stress.

Lunch Lady, a secret crime fighter, accompanies the Breakfast Bunch on a class trip to an art museum, but when Dee, Hector, and Terrence begin to think there is something strange afoot, she suspects nothing.