DETECTIVE COMICS #398 PAGE 4

Detective Comics #398 is an issue of the series Detective Comics (Volume 1) with a cover date of April, 1970.
"The Poison-Pen Puzzle!"

On a trip to Hollywood to check out a movie studio on whose board he now sits, Bruce Wayne witnesses a the murder of a notorious writer and must become Batman to find the killer.
After a lenthy investigation, Batman finds that there are two people who claim to have murdered the writer.
Batman interrogates the supposed killers, but none of them fit the shape of the murderer. After his failed interrogation, Batman is confronted by the real killer, but he manages to capture him with help from the couple who confessed to the crime.