Hall of mirrors / John Copenhaver.

Enhanced descriptions from Syndetics:

When a popular mystery novelist dies suspiciously, his writing partner must untangle the author's connection to a serial killer in award-winning John Copenhaver's new novel set in 1950s McCarthy-era Washington, DC.

In May 1954, Lionel Kane witnesses his apartment engulfed in flames with his lover and writing partner, Roger Raymond, inside. Police declare it a suicide due to gas ignition, but Lionel refuses to believe Roger was suicidal.

A month earlier, Judy Nightingale and Philippa Watson--the tenacious and troubled heroines from The Savage Kind --attend a lecture by Roger and, being eager fans, befriend him. He has just been fired from his day job at the State Department, another victim of the Lavender Scare, an anti-gay crusade led by figures like Senator Joseph McCarthy and J. Edgar Hoover, claiming homosexuals are security risks. Little do Judy and Philippa know, but their obsessive manhunt of the past several years has fueled the flames of his dismissal.

They have been tracking their old enemy Adrian Bogdan, a spy and vicious serial killer protected by powerful forces in the government. He's on the rampage again, and the police are ignoring his crimes. Frustrated, they send their research to the media and their favorite mystery writer anonymously, hoping to inspire someone, somehow, to publish on the crimes--anything to draw Bogdan out. But has their persistence brought deadly forces to the writing team behind their most beloved books?

In the wake of Roger's death, Lionel searches for clues, but Judy and Philippa threaten his quest, concealing dark secrets of their own. As the crimes of the past and present converge, danger mounts, and the characters race to uncover the truth, even if it means bending their moral boundaries to stop a killer.