Untitled Tessa Coates Action-Adventure Series (1970)

Best friends, Judith and Debbie, know everything about each other … well, almost everything. Judith has been living a double life that Debbie knows nothing about: she is a highly trained assassin. When a hit goes horribly wrong, Judith and Debbie must go on the run together and work to repair their broken friendship—all while being targeted by a mysterious enemy who wants them dead. And only together, can they solve this layered mystery.