On the last night in October 1999 the clocks went back, and Ella and Will's love began.A teenage Ella sat around a bonfire drinking with her future husband and her oldest friend Cole.As Ella wandered away from the group, she found herself leaning against a derelictarchway before passing out.The next day, Ella remembered fractured images of a conversation with a womanin a green coat and red scarf but dismissed it as a drunken dream.Twenty-three years later, with her marriage to Will in trouble, and Cole spiralling out ofcontrol, Ella opens a gift which turns her life upside down: a green coat and red scarf.When she looks in the mirror, the woman from the archway is reflected back at her.As the last Sunday in October arrives, Ella is faced with a choice.Would she choose a different life, if she could do it again?