There are 3 books in the Kate Waters Series series. The newest book is The Suspect which came out in 2018.

1
The Widow

Book cover of The Widow

THE SUNDAY TIMES AND NEW YORK TIMES BESTSELLER, AND RICHARD & JUDY BOOK CLUB PICK

'If you liked GONE GIRL and THE GIRL ON THE TRAIN, you might want to pick up THE WIDOW by Fiona Barton. Engrossing. Suspenseful' Stephen King

We've all seen him: the man - the monster…

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2
The Child

Book cover of The Child
From the New York Times bestselling author of The Widow comes a twisting novel of psychological suspense—as seen in People, Entertainment Weekly, Time, USA Today, Bustle, Good Housekeeping.com, HelloGiggles, The Boston Globe, PureWow, The Dallas Morning News, and more!  
 
“The Child is a perfect blend of beach read and book…

3
The Suspect

Book cover of The Suspect

WHAT IF IT WAS SOMEONE YOU KNEW?

'Utterly engrossing . . . I lived inside this book for two days - and I'm still thinking about it. Superb!' Shari Lapena, bestselling author of THE COUPLE NEXT DOOR

'Intelligent, insightful and compelling. A clever, twisting whodunnit that delivers an emotional punch.…