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
“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
“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
“Tightly focused and fast-paced. You won’t rest until you really know what happened.” — Lisa Ballantyne, author of The Guilty One
“A nuanced, completely addictive debut.” — People
“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
“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
“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
“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
“A very clever, tautly plotted page turned from a terrific new writer” — Good Housekeeping
“An engaging debut.” — Kirkus Reviews
“Macmillan peppers her debut with subtle red herrings and a variety of potential suspects, ratcheting up the tension slowly but oh so deliciously.” — Booklist
“Readers will have a tough time putting this one down. — Publishers Weekly
“…a clever, dark, compulsive read… If you liked All the Missing Girls 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
