The Koots are on the trail of a counterfeiter after Ben and Toby are questioned by Officer Gomez about passing a fake twenty-dollar bill.
The Koots investigate the appearance of a flying cloth-bound object that looks exactly like a mummy.
Trying to juggle his job at "Taste of Italy" along with writing papers for school and his graduation requirement to volunteer at the Golden Oaks Retirement Home, class clown Derrick uses humor to get the jobs done.
Cody Smith and his family are new in a small town. When he reads an article about a local woman who collects antique carousel horses and was sold a fake, Cody wants to solve the mystery and find the crook.
Having finished his education at Blackstone School, Red Fox writes letters to his friend, Ellen, who is traveling in Europe, as he prepares to return to his family on the Nebraska plains.
While working together on a school report about the 1960s, Aleesa and Kenneth are transported to March 1968, where they suddenly realize that the death of Martin Luther King, Jr. is only days away.
As Stalin's purges and arrests increase, Sasha and his mother plan to leave Russia to join his father and older sister who have emigrated to Riga, Latvia.
Cody finds himself in danger when he receives a note that warns him of bad luck on his big bike ride. He has to find out who's behind the note and why he is the target.
When Cody, his mom, and his friend Maria arrive in the Florida Keys to house-sit for their friend Sally West, they are warned about a kidnapper at large in the neighborhood who tried to abduct young Angela Gomez.
Cody and his friend Maria find themselves in the middle of several mysteries as they search for a missing emerald necklace.
Cody is involved in another mystery. When the cat keeps vanishing and a mysterious stranger is hanging around, Cody needs to do a little investigating to solve the case.
Transported accidentally back in time to a college campus in the South in 1931, Kenneth and Aleesa meet the young Langston Hughes on his poetry-reading tour and confront racism and threats to Hughes first-hand. What do they discover about the real power behind his words?
Eighth-grader Derrick wants to be a stand-up comedian, but his football coach, his parents, Joe, his boss at Taste of Italy, his English teacher Dowling the Dragon, and his Mr. Perfect older brother Craig don't think he's so funny. When Derrick discovers he needs a B on an English paper to stay eligible for football, how can he tame his smart mouth to stay out of trouble?
While spending the summer on his grandparents' Texas cotton farm, Michael sees a teenage boy on the other side of the Rio Grande in Mexico. He starts to write letters to Javier, and then helps him cross the river to come into the United States.
While on detention for disrupting a science lesson, Kenneth and Aleesa are transported to 1939 where they try to protect the privacy and even the life of Albert Einstein as he struggles to decide whether he should help build an atomic bomb to stop Hitler. Can they stop the Nazis from getting the atom bomb first?
After being adopted by Michael's family and moving from Mexico to Dallas, Javier tries to adapt to life in the United States but realizes he misses his old life in Vera Cruz, Mexico.
After having left Russia to live in freedom in Latvia, Sasha finds his adopted country increasing under threat of invasion from Hitler's growing war machine.
Sasha tries to adjust to his new life in the United States, but his thoughts keep returning to the deepening troubles in his home country, Latvia, as Hitler's bombs fall on Riga in June of 1941.
Cody Smith and his friends are immersed in mysteries for each of the holidays.
David travels back in time to 1906 San Francisco to try to save the lives of Antonio Giovanni and his family who were victims of the devastating earthquake.
David and his family travel back in time to California in 1849 to experience the ups and downs of prospecting for gold.
David and his family travel back in time to San Antonio, Texas in 1836 and meet brave defenders of the Alamo such as Davy Crockett.
David and his family use his grandfather's time travel machine to go back in time to the Chicago where David is teaching four boys to speak English as he experiences the Chicago World's Fair. .
David and his family use his grandfather's time travel machine to travel to 1853 Ohio, where they assist runaway slaves on their journey north on the Underground Railroad.
Kenneth and Aleesa, working on an extra credit project about Socrates, suddenly find themselves in ancient Athens, where they meet the famous philosopher and try to save his life.