Holy Catnip! With business booming, Cat Detectives, Buckley and Bogey, have their paws full when it comes to running the BBCDA -- the Buckley and Bogey Cat Detective Agency. But just when they're ready to take a little break, someone leaves them a clue . . . right on their own front porch! Naturally, the boys are suspicious, since they usually have to hunt long and hard to find any clues on a case. And things get even more odd when the clues just keep on coming -- all in little glass jars with shiny black lids. Especially when one of those jars holds a bunch of sparkly diamonds. Holy Mackerel!

But clues aren't the only things that land on the boys' front doorstep. Soon their family takes in a few foster cats, including an energetic kitten with an overactive imagination. One who is determined to follow Buckley wherever he goes, even as the boys track clues all over town! And when clues just lead to more clues and yet more clues, it isn't long before Buckley and Bogey realize there is something sinister going on in their little city of St. Gertrude. From creepy mansions to angry bees, and from rescue operations to midnight visitors, this case has way more danger than the boys ever bargained for. And before long, they learn the stakes could not be higher, especially when their family is framed for a crime. That's when the boys have no choice but to add up all those clues in a hurry and crack the case . . . or else! Holy Catnip!