Bliss & Blunder by Victoria Gosling

Arthur and Gwen married young. Twenty years on, Gwen's got it all: wealth, beauty, a famous husband who's the founder of Britain's most successful tech company, stables full of horses, millions of followers on Instagram, an unstable lover, a wayward son, a hoard of secrets, an aching heart, and a cyberstalking blackmailer who calls himself The Invisible Knight.

As the Wiltshire town of Abury prepares to celebrate the fortieth birthday of its favourite son, Morgan, Gwen's former best friend, is on her way back to Abury after two decades away, keen to expose Abury's long buried secrets and hellbent on revenge. An inventive, magisterial reworking of Britain's greatest myth, Bliss & Blunder is a heartrending novel of power, friendship and betrayal.