"The Thea Sisters travel to New York to cheer for Nicky as she runs the Big Apple Marathon. While there, they visit Pamela's family and have a delicious dinner at the family's pizzeria. But when someone threatens to burn the restaurant down, can the Thea Sisters catch the troublemaker and solve the mystery?"--P. [4] of cover.

Attending an ecological conference in Alaska, the Thea Sisters are introduced to local games and customs by their native Alaskan hosts before discovering that someone is endangering the ecosystem by using explosives to blow up the ice.

"The Thea Sisters are visiting a friend in Ecuador who has a sweet job--he runs a chocolate factory! His factory is in the running for the Chocolate Cup, a major award. But suddenly, chocolate production starts to malfunction. Is it sabotage? It's up to the Thea Sisters to crack this candy-filled case!"--Back cover.

"When Paulina gets a phone call from home telling her that a friend is missing, the Thea Sisters travel to Peru to help solve the mystery. There, the five mice climb the Andes Mountains in search of a missing archaeologist. Along the way, they stumble upon clues leading them to a mysterious hidden city. Will the Thea Sisters find Paulina's friend, and the treasure of the Secret City?"--P. [4] of cover.