Willow Olivia Walker is a newly single Cambridge University student heading home for the summer holidays, following a bitter split with her controlling and manipulative ex-girlfriend, Kristina.

Initially dismayed to discover her eccentric parents have hired the beautiful Georgia as a live-in nanny for her two younger sisters, she treads carefully, but slowly, a friendship blossoms that has the potential to bloom into something special.

Discovered in flagrante by her over-bearing mother, Willow packs her bags and returns to Cambridge, intent on spending the remainder of the summer months preparing for the academic year ahead. A chance encounter between Willow and barely separated university professor, Francesca Marten, is the start of a friendship that extends beyond the confines of student and teacher.

In Francesca, Willow finds a lover who knows what she wants, but for Francesca, Willow is the epitome of the young, carefree girl she left behind 20 years before.

As Willow and Francesca’s friendship blossoms, danger lurks around the corner, as somebody is watching their every move, intent on revenge for what they perceive as the ultimate betrayal.

Together, Willow, Francesca, and a host of others dig deeper to find the tormenter threatening to derail their future paths.