From a conversation between Ellroy and novelist David Peace, in the Guardian back in 2010:
DP Did you write American Tabloid knowing it would be the first book of a trilogy?--Marshal Zeringue
JE As I began the finishing of Tabloid, I saw that it was a trilogy, and I saw that the second book would be the big book about the 60s.
DP Had you also envisaged the third book?
JE Not in any kind of detail, no. Because the politics and the social upheaval of America during the 60s are so obvious – you got the anti-war protests, the civil rights movement, the racism of the South, Howard Hughes buying up Las Vegas – I had a lot of it right at the gate. But when you go into 1972, as this book [Blood's a Rover] does, it's less charted territory.
DP At what point did you decide on the various timeframes for each novel?
JE I had decided to end the first two books with the assassinations (of JFK in 1963, and Martin Luther King and Robert Kennedy in 1968), and then the death of Hoover in '72 unfolded as the logical conclusion to the trilogy.
DP These are huge stories, huge histories. What are your research methods?
JE They are...[read on]