The Demi God Diaries by Rick Riordan and Haley Riordan

A collection of characters from the Percy Jackson world.  All are well written and give us more information about the world of the Greek deities and their offspring.   The first stories are written by Mr. Riordan and as always they are enjoyable.
The last story goes in a different direction and was the best of the collection.  It was written by his son, Haley Riordan, a young writer that if he continues may do very well as an author.  The main character is not a demi god, just a regular mortal who does not believe in an afterlife and writes books about his theories and is a paid speaker on the same subject.  His world is rocked when he meets a demi god and then attempts to save him.
Best if the reader is familiar with the series but as a collection of short stories it is a stand alone read.