An excellent collection of one of Erle Stanley Gardner's top 5 (IMHO) creations.
Like so many of Gardner's 30's era characters, Leith is a man of leisure, who solves crimes and makes a profit doing so, making a fool out of the police.
In this case, the police have even infiltrated a cop as Leith's butler, who goes around trying to get Leith interested in various crimes the police can't solve.
Very entertaining pulp.