Heres a piece thats versatile enough for every season, every reason.

There are two stories/TV episodes in each book so they are 'flipper' books, with a front cover for each story.
THE CASE OF THE PLOT TO PULL THE PLUG
An evil mastermind plans a nationwide prison escape!
THE CASE OF THE THIEF WHO DRINKS FROM THE TOILET
Local pets have become part of a criminal gang!

No matter the context, this ones here to make a positive difference.