“Every parent’s nightmare, handled with intelligence and sensitivity, the novel is also deceptively clever. I found myself racing through to find out what happened.” - Rosamund Lupton, international bestselling author of Sister
“What an amazing, gripping, beautifully written debut. WHAT SHE KNEW kept me up late into the night (and scared the life out of me).” - Liane Moriarty, New York Times bestselling author
“Tightly focused and fast-paced. You won’t rest until you really know what happened.” - Lisa Ballantyne, author of The Guilty One
“This accomplished, intelligent debut should come with a warning--it’s completely addictive. A nail-biting, sleep-depriving, brilliant read.” - Saskia Sarginson, author of The Twins
“One of the brightest debuts I have read this year - a visceral, emotionally charged story….heart-wrenchingly well told and expertly constructed, this deserves to stay on the bestseller list until Christmas” - The Daily Mail
“A terrific debut” - Reader's Digest
“Readers will have a tough time putting this one down. - Publishers Weekly
“Gilly Macmillan introduces some smart variations on the [missing child] theme in her debut mystery...Macmillan enlivens the narrative with emails, newspaper headlines, passages from professional journals, even transcripts from Inspector Clemo’s sessions with a psychotherapist. But her best move is to include vicious blog posts that go viral.” - New York Times Book Review
“A mother and son spend an ordinary Sunday at a park near Londontown. Until the boy goes missing. Cue dramatic music. This read’s basically The Changeling meets an episode of Law and Order: Special Victims Unit but set in the UK.” - The Skimm
“…a clever, dark, compulsive read… If you liked <em>All the Missing Girls</em> by Megan Miranda, you’ll also enjoy this one.” - Birmingham magazine
“If you like a good nail-biting, scary read...[t]his was a brilliant read!...This story is fast-paced, smart, technologically current, and every parent’s nightmare! If you enjoyed the film I did, Kidnap, you’ll love this addictive adventure.” - Halle Berry
“A very clever, tautly plotted page turned from a terrific new writer” - Good Housekeeping
“Macmillan peppers her debut with subtle red herrings and a variety of potential suspects, ratcheting up the tension slowly but oh so deliciously.” - Booklist
“Heart-in-the-mouth excitement from the start of this electrifyingly good debut…an absolute firecracker of a thriller that convinces and captivates from the word go. A must read.” - Sunday Mirror
“An engaging debut.” - Kirkus Reviews
“A nuanced, completely addictive debut.” - People