Author Tanya Frank discusses her book 'Zig-Zag Boy A Memoir of Madness and Motherhood', which chronicles the experiences of her son Zach who experienced psychosis as a 19-year-old. Author Tanya Frank discusses her book 'Zig-Zag Boy: A Memoir of Madness and Motherhood', which chronicles the experiences of her son Zach who experienced psychosis as a 19-year-old.