Fusion GPS announced the November release date of a book on its 2016 investigation into Donald Trump’s ties to Russia, promising to shed new light on British ex-spy Christopher Steele’s dossier about the future president.

The Washington, D.C.-based opposition research firm’s book, announced Monday, is expected to come a few weeks after release of a report into the origins of the investigation into Trump and Russia, which has shadowed his presidency since taking office in January 2017. Justice Department Inspector General Michael Horowitz’s report is expected to cover allegations of abuse of the Foreign Intelligence Surveillance Act by the FBI and the Department of Justice — including the government’s reliance on Steele’s dossier to obtain surveillance warrants from the Foreign Intelligence Surveillance Court to monitor Trump campaign associate Carter Page.