Recruited by the mysterious Project Kairos to change history and save the future from ecological disaster, Echo and Hazel are transported through time to opposite worlds. Echo works as a healer’s assistant in Ancient Athens, embroiled in dangerous politics and wild philosophy. Hazel is the last human alive, in a laboratory on a polluted island with nothing but tiny robots and an untrustworthy AI for company. Both women suffer from amnesia, but when they fall asleep, their consciousnesses transcend time and they meet in their dreams. Together, they start to uncover their past – but soon discover the past threatens humanity’s survival. If Echo and Hazel have a chance of changing the future, they must remember to forget…