I.O.U.

A Chilling Thriller Where Debts Must Be Paid… in Blood

I.O.U. by Nicholas Adams is a gripping teen horror novel filled with suspense, secrets, and sinister consequences. First published in 1993 by Collins, this fast-paced read blends high school drama with a deadly mystery, perfect for fans of 90s YA thrillers.

A Deadly Debt from the Past

When a group of high school friends start receiving mysterious notes marked "I.O.U.," they think it’s a prank — until one of them turns up dead. As the body count rises, it becomes clear that someone is collecting on an old debt... and they won’t stop until everyone pays. With tension mounting and fear spreading through the group, secrets begin to surface, and the truth behind the terrifying messages is darker than anyone imagined.

Classic YA Suspense with a Sinister Twist

Nicholas Adams delivers a page-turning thriller packed with twists, red herrings, and shocking revelations. I.O.U. taps into the fears of adolescence — betrayal, guilt, and the past catching up with you — in a tightly woven plot that keeps readers guessing until the final page.

A must-read for fans of vintage teen horror and suspense-filled stories where nothing is as it seems.