'The Box in the Woods' by Maureen Johnson is a fun fourth installment in the Truly Devious series though it lacks the complexity of the original trilogy.
After solving the Ellingham mystery, Stevie Bell is now known more widely as a teenage sleuth and so it comes as not much of a surprise when she is contacted by a man who wants to solve a decades old mystery at a summer camp. In 1978, four teenagers were killed at Camp Wonder Falls and the crime was never solved. The new owner wants Stevie's help to solve this mystery for a true crime podcast. Though she isn't too thrilled about the podcast, Stevie can't pass up the opportunity to uncover the truth of another crime that has long been buried.
Maureen Johnson has proven with the Truly Devious series that she can create a really fun and compelling mystery that keeps readers engaged through the last page. This is true in 'The Box in the Woods' though without the three book space to delve as deeply into the story, it's a much quicker and slightly less complex mystery. For those who have read the original trilogy, this is a fun addition to the series and it's great to return to the characters. If this is the start of a spin-off series of one-off mysteries, I think that it could work. If it is merely a follow-up to the original, it makes less sense as it doesn't really add anything to the trilogy beyond being another fun mystery. I will be interested to see what Johnson does next with these characters if this is the start of something new. 

It was great to jump back in with Stevie, Nate and Janelle as they delve into a new mystery outside of Ellingham Academy, which made the book feel fresh and interesting. David returned and was somewhat tolerable. I look forward to seeing more from the (scooby) squad!

I love Stevie Bell, and it was very fun and exciting to read a standalone mystery of hers.