When Kurt’s phone rings during sex – and he reaches to pick it up – Susan knows that their marriage has passed the point of no return. Since they swapped their family home for an ‘executive’ newbuild on an estate still under construction, she has felt ever more aware that there is something missing in her life: the absence of any kind of meaningful communication with Kurt, who only has Facetime for Wendy (the nickname she has given to the ubiquitous phone), or her twin boys, with whom she communicates via notes left on the middle shelf of the fridge. This sense of loss becomes increasingly focused on a cache of handwritten letters, from her first love, Antony, mementoes of a time when devotion seemed to spill out easily onto paper. Increasingly desperate, Susan embarks on a journey of discovery that will reconnect her to her younger self, while simultaneously revealing her future.