The Diamond Brothers in Public Enemy Number Two by Anthony Horowitz
Meet the Diamond Brothers, the world's worst private-detective agency, in this Chandler-esque spoof from the creator of the Alex Rider series. Wisecracking young Nick Diamond finds himself sharing a prison cell with Johnny Powers, Public Enemy No.1. His only chance of rescuing the situation is to nail master criminal the Fence. But first, Nick has to get out of jail...