Davey & Derek Junior
Detectives Series by Janice (J. E.) Spina.
Series Intended For Middle-Grade, Preteen,
Teens and YA.
Jems Books (Reading Gives You Wings To Fly).
https://bookmarketingglobalnetwork.com/shop-book-series-for-teens-and-young-adults/davey-derek-junior-detectives-series-by-janice-j-e-spina/