Derek Lucas

Secret Seven Fireworks (Knight Books)

By Enid Blyton, Derek Lucas, Blyton, Enid, Enid.

Look Out Secret Seven

By Blyton, Enid, Derek Lucas, Enid Blyton, Burgess Sharrocks

Secret Seven Adventure

By Blyton, Enid, Derek Lucas, Enid Blyton

The Secret Seven (Knight Books)

By Blyton, Enid, Lucas, Derek, Illustrated by Lucas, Enid Blyton, Derek Lucas