She lost her sister. Now someone is making sure she loses her mind. Four years after witnessing her sister Beth disappear without a trace, Maya Brennan is still drowning in the aftermath. The guilt and isolation of a small Irish coastal town forces her to believe she could have imagined it all. But when a mysterious laptop appears in her home, everything changes. Because the first email she reads was sent from Beth's long-dead account. As more messages arrive, Maya becomes certain that someone is watching her. Someone who knows all about her weaknesses and her past. Soon, neighbours think she's relapsing into alcoholism, colleagues keep their distance and even the people she trusts the most begin to look like suspects. Someone wants to terrify her. Someone wants the truth to stay buried. But now Maya can't ignore what she saw that fateful day. In a town full of secrets, Maya must face the haunting truth: What if Beth really is out there? And what if the biggest threat of all is the one she's already let in? I Know What I Saw is a twist-filled psychological thriller about obsession and guilt, and is perfect for fans of Andrea Mara and Alice Feeney.