Stuart Gibbs

The FunJungle series is about a boy named Theodore (Teddy) Fitzroy who lives with his family in the largest zoo in America, the (fictional) titular FunJungle. Teddy and his friends solve various mysteries that occur around the zoo, trying to watch out for people that will make his life harder, such as Marge "Large Marge" O'Malley and the ever dubious billionaire owner of FunJungle, J.J. McCracken. As the series progresses, Teddy becomes friends with, and later starts dating, J.J.'s daughter Summer McCracken. Currently, Teddy has solved six mysteries that revolve around a main zoo animal who is in danger.[4]

1. Belly Up (2010)
2. Poached (2014)
3. Big Game (2015)
4. Panda-monium (2017)
5. Lion Down (2019)
6. Tyrannosaurus Wrecks (2020)
7. Bear Bottom (2021)

In the Spy School Series, twelve-year-old Benjamin Ripley gets recruited to the top-secret CIA academy of espionage. He has several successful missions against the evil spy organization SPYDER with fellow spy Erica Hale.

Books:

1. Spy School (2012) Benjamin Ripley is originally recruited as "bait" to catch a "mole" but ends up becoming a real spy due to his satisfactory achievement in his mission, where he stopped a bomb from exploding and killing several top espionage leaders.
2. Spy Camp (2013) In the second book in the series, Ben attends the CIA's 'summer camp' version of spy school. He meets Erica's grandfather, Cyrus Hale, who was a successful spy in his early days and is still a top spy. SPYDER tries to recruit him, but he turns them down and foils their evil plans again.
3. Evil Spy School (2015) After being expelled from the CIA's top-secret spy school, Ben is forced into SPYDER's espionage academy in their headquarters. SPYDER tricks him into doing complex mathematical problems to plan a missile strike on New York City. Later, he is saved from SPYDER by Erica and Cyrus, and not only stops the missiles from launching at New York but redirects them to SPYDER's headquarters, nearly being killed.
4. Spy Ski School (2016) In the fourth book in the series, Ben, Erica, Cyrus, and several other students at the academy are sent to Vail, Colorado to keep tabs on Leo Shang, a Chinese billionaire who is at the resort. Ben befriends Shang's daughter, Jessica, revealing the compassion Erica has for him that she has hidden under her icy personality. Ben finds out Shang's plan and stops a nuclear bomb from destroying a good part of Colorado.
5. Spy School Secret Service (2017) After being assigned to befriending the President of the United States' son, Ben is planted with bombs by SPYDER in an attempt to blow up the Oval Office and framed for the explosion. He becomes a wanted criminal, but with help from Erica, Cyrus, and other Spy School Students stops SPYDER from threatening the rest of the world with the USA's nuclear arsenal for money.
6. Spy School Goes South (2018) In this book, Ben and Erica are sent to Aquarius, a prestigious beach resort on the Yucatan Peninsula to follow SPYDER agent Murray Hill as he leads them to SPYDER's new headquarters. They find SPYDER is nuking Antarctica, causing a rapid speed-up of Global Warming. Together Ben and Erica foil their plans, as well as imprisoning some of their operatives.
7. Spy School British Invasion (2019) Taking place right after Spy School Goes South, Ben and Erica, with Erica's mom Catherine Hale (Who is in the MI6), follow a lead taking them to Mr. E, the supreme leader of SPYDER, in Paris, France. They figure out SPYDER's final plan, and prevent it from taking place, as well as capture Mr. E, defeating SPYDER for good.
8. Spy School Revolution (2020) Ben returns and has to tell his parents that he is training to be a spy, meanwhile, Erica attacks the room that they have moved from because she is being blackmailed to do it. Ben fights a new evil organization as he tries to prove Erica's innocence.[5]
9. Spy School at Sea (August 31,2021)

The MBA series takes place in 2041 where Dashiell Gibson and his family are recruited to go to Moon Base Alpha, the first human lunar colony. Dashiell has to solve mysteries in each book.[6]

1. Space Case (2014)
2. Spaced Out (2016)
3. Waste of Space (2018)

The Last Musketeer series is about a boy named Greg who goes back in time to the time of the Three Musketeers to save his parents.

1. The Last Musketeer (2011)
2. Traitor's Chase (2012)
3. Double Cross (2013)

The Charlie Thorne series centers around a 12-year-old genius named Charlie Thorne, who is trying to recover a deadly equation referred to as Pandora, which was written by Albert Einstein. And if Pandora gets in the wrong hands, deadly things could happen.

1. Charlie Thorne and the Last Equation (2019)
2. Charlie Thorne and the Lost City (2021)
3. Untitled (2022)