EXCLUSIVE: FX has put in development a drama series adaptation of Chelsea Cain’s best-selling book series Heartsick. The thriller novels, Heartsick, Sweetheart and Evil At Heart, center on beautiful serial killer Gretchen Lowell and her relationship with damaged Portland detective Archie Sheridan. Mikko Alanne (5 Days Of War) is set to write the series adaptation. Manager/producer Geyer Kosinski (Magic City) is executive producing through his Media Talent Group.