Camp Half-Blood Chronicles is the name of the first book in a series. That series precedes The Demigod Diaries in 2012.
The Heroes of Olympus is a pentalogy of adventure, mythological fiction and fantasy novels by American author Rick Riordan that collectively form a sequel series to the "Percy Jackson & the Olympians" series. 
Percy Jackson & the Olympians, often shortened to Percy Jackson, is a pentalogy of adventure and mythological fiction books written by American author Rick Riordan, and the first book series in the Camp Half-Blood Chronicles. 
The Demigod Diaries is collection of short stories relating to "The Heroes of Olympus" book series. 
