What if you had to crack a code to save a life? A critically acclaimed book for younger readers from the author of the bestselling Noughts and Crosses sequence.

It's just your average Friday night. Then the police show up.

Your mum's been caught on CCTV, breaking into a giant chemical company. They say she's working undercover for A.N.T.I.D.O.T.E, a group against animal testing - but how is that possible? She's not a spy - is she? Now she's on the run - and only you can uncover the truth. And you've got to crack a code to do it.

A gripping story from the bestselling author of Noughts and Crosses, Malorie Blackman.