I brought a PC game called Lion head studios The Movies but now i have lost the book and need the access code to reinstall the game?

According to Activision's online support you will be unable to get a replacement code. Quote from their support pages:

Question

My Key Code was lost/stolen

Answer

Unfortunately we cannot replace your stolen or lost Key, as we do not have any keys to give out. The Keys are placed in the packaging at the manufacturing plant. As stated in the game manual, "If you lose your CD-Key, you will not be issued another one."