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Erin has felt barely alive since the loss of her young daughter. Moving through grief is like swimming against a current. Her estranged husband, Zac, a brilliant astrophysicist, is faring better, lost in his work tracing a rare cosmological phenomenon. When Erin receives a phone call from her daughter's school, the same call she received when her daughter was alive, Erin realises something is happening. Again. The phenomenon Zac is tracking may have presented her with the chance to save her daughter. As Erin is swept through time she must battle to keep the past from repeating