The #1 New York Times bestselling author of It Starts with Us joins forces with the New York Times bestselling author of The Wives. Together, they have created a gripping, twisty, romantic mystery unlike any other. Never stop...Never forget...Just remember. Charlie Wynwood and Silas Nash have been best friends since they could walk. They've been in love since the age of fourteen. But as of this morning...they are complete strangers. Their first kiss, their first fight, the moment they fell in love...every memory has vanished. Now Charlie and Silas must work together to uncover the truth about what happened to them and why. But the more they learn about the couple they used to be...the more they question why they were ever together to begin with. Forgetting is terrifying, but remembering may be worse.