Daisy Darker by Alice Feeney : Kindle Edition

"Alice Feeney is great with TWISTS and TURNS." —Harlan Coben
The NEW YORK TIMES BESTSELLING AUTHOR of Rock Paper Scissors returns with a locked-room mystery when a family reunion leads to murder in a delightfully twisty and atmospheric thriller, as seen on the TODAY show.
"A dysfunctional family meets Agatha Christie's And Then There Were None with a truly gasp-inducing twist. This is the book you've been looking for."—Catherine Ryan Howard, bestselling author of 56 Days
Daisy Darker was born with a broken heart. Now after years of avoiding each other, Daisy Darker's entire family is assembling for Nana's 80th birthday party in her crumbling gothic house on a tiny tidal island. The family arrives, each of them harboring secrets. When the tide comes in, they will be cut off from the rest of the world for eight hours.
But at the stroke of midnight, as a storm rages, Nana is found dead. And an hour...