 In 1960 she and Olivier divorced and Olivier soon married actress Joan Plowright . In his autobiography , Olivier discussed the years of strain they had experienced because of Leigh 's illness : " Throughout her possession by that uncannily evil monster , manic depression , with its deadly ever @-@ tightening spirals , she retained her own individual canniness – an ability to disguise her true mental condition from almost all except me , for whom she could hardly be expected to take the trouble . " 
