Alex Casey

Alex Casey is an action-thriller series of 6 books written by Alan Wake.

Books

The series has been found to have similarities with one of Remedy Entertainment's other game franchises, called Max Payne.
The Alan Wake Files feature the first chapter of Return to Sender.
In the live-action short "Alan Wake's Return", Sam Lake's character shares Casey's name, but is ranked as an FBI Agent rather than a (presumably) Private Investigator.
The name of the books 5 and 6 share the mindset of Richard B. Riddick's quote: "It ain't the fall that gets you. It's the sudden stop at the bottom", from The Chronicles of Riddick: Escape from Butcher Bay game; Casey died in The Sudden Stop.
"The Fall of Casey" seems to be a reference to the title of the second Max Payne game in the franchise, Max Payne 2: The Fall of Max Payne, while "The Things That I Want" name of the fourth book is a reference to a chapter in the same game.