Ivy + Bean: Annie Barrows: http://anniebarrows.com/kids-home/ivy-bean/
James Ponti: https://www.jamesponti.com/city-spies
Click on the links to view the website:
Stuart Gibbs: https://stuartgibbs.com/books-2/spy-school/
Terri Libenson author of the Just Jaime series: https://terrilibenson.com/just-jaime/
Raina Telgemeier, author/illustrator of Guts, Smile, Sisters, and some of the Babysitter Club graphic novels:https://goraina.com/
Tui Sutherland, author of Wings of Fire: https://tuibooks.com/wings-of-fire/