Lara decides to go to a new gym with Mr and Mrs Cook - she has a bit of a pooch paunch to shift. But she makes a shocking discovery!Harriet Hawk, the evil gym owner, is brainwashing everyone into becoming an army of criminals, robbing banks and raiding jewellers all over the country. But there's an even more dastardly masterplan afoot - to use the hypnotised grownups to kidnap the country's school children!

Lara and the pups must stop her and save a brainwashed Mr and Mrs Cook - and unsuspecting Sophie, Ben and Oliie - before it's too late!