There are 2 books in the The One and Onlys series. The newest book is Finally, Something Dangerous which came out in 2022.

1
Finally, Something Mysterious

Book cover of Finally, Something Mysterious
The best mysteries can only be solved with your best friends. The perfect summer read for fans of Stuart Gibbs.

Paul Marconi has always thought that Bellwood was a strange town, but also a boring one. Not much for an eleven-year-old to do. Fires are burning nearby, Paul's parents are…
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2
Finally, Something Dangerous

Book cover of Finally, Something Dangerous
The mystery-solving trio, the One and Onlys, from Finally, Something Mysterious is back with another whodunit. Robot crows, a poetry-slash-wrestling Club, and a hamster infestation? This looks like another case to tackle!

As the excitement from the last mystery the One and Onlys solved is starting to dwindle, Shanks, Peephole,…