Swimming Upstream — Ruth Mancini

"I once read that the end of a relationship is like being involved in a road traffic accident. Which is quite fitting really, given what happened." 

After seven years, Lizzie wonders whether she is truly happy with her long-term boyfriend. When one wrong step and a chance meeting set off an unexpected chain of events, her life begins to unravel. On the same day that she meets Martin, an attractive lifeguard, her old friend, Catherine, re-appears. But is Martin really all he seems? And what is the secret that Catherine is hiding? As Lizzie struggles to confront the ghosts of her past, can she survive the shocking twist that will change the course of her future?