The third and fourth Kinsey Millhone mysteries combined into one volume. Kinsey, our private detective protagonist, is given just enough characterization to lend a little humanity to the character, but as with the previous two volumes, these are really plot-oriented stories, focused on solving the mystery.
C is for Corpse revolves around a client who comes to Kinsey after a car accident has left him badly disabled and given him memory loss. He isn't sure but he believes someone may have tried to kill him and may try to do so again, but doesn't know why.
D is for Deadbeat involves a client who shows up with a cashier's check that he wants Kinsey to deliver to a third party. However, the client is found dead before the check can be delivered and Kinsey suspects there is more than meets the eye going on.
Both of these are entirely serviceable mysteries though hardly memorable. While Kinsey is a good character, the biggest flaw in all of Grafton's books I've read is that the cast of supporting characters is too interchangeable. Invariably I start to have trouble keeping them straight in my mind or remembering what possible motivations might have them connected to the case. In an Agatha Christie book, for example, she often makes her supporting cast big colorful cliches, which you might say is not necessarily good or realistic writing, but it does have the virtue of helping me recall who's who without creating a cheat sheet.
One additional point in favor especially of D compared to the first three alphabet books is that it does not get the action movie ending that the first three have. Instead of a shoot-out or physical altercation, it ends on a quiet and sad note. Also, I will give some credit that Grafton does give Kinsey some memory of what happened in the previous books and makes occasional references to previous events, so the story feels a little more connected than the totally siloed Poirot books, for instance.
Still, these are more or less the definition of B-minus material, good enough to get by but not something you are going to put on the front of the refrigerator.