One happy couple. Two divided families. A wedding party to die for.

On the private island of Castello Fiore - surrounded by the glittering waters of Lake Garda - the illustrious Heywood family gathers for their son Laurence's wedding to Italian influencer Eva Bianchi.

But as the ceremony begins, a blood-curdling scream brings the proceedings to a devastating halt.

With the wedding guests trapped as they await the police, old secrets come to light and family rivalries threaten to bubble over.

Everyone is desperate to know . . .

Who is the killer?

And can they be found before they strike again?