Here is a list of all their picks from the start:
“Killer Triggers” by Jow Kenda
“The Better Liar” by Tanen Jones
“The Spider” by Barry Levine
“Half Moon Bay” by Jonathan and Jesse Kellerman
“Pretty Things” by Janelle Brown
“The Holdout” by Graham Moore
“Natalie Wood” by Suzanne Finstad
“The Ghosts of Eden Park” by Karen Abbott
“The Other People” by C.J. Tudor
It appears like they post a book about every 3ish months!