The famous London clock, Big Ben, is stolen and Secret Squirrel and Morocco Mole are called to solve the crime. Secret and Morocco arrive at the crime scene and find a giant footprint. Secret uses one of his devices and learns that the thief was the giant at the top of the beanstalk.
Secret and Morocco find the beanstalk and use the elevator to get to the top where they find the giant has put Big Ben in a cuckoo clock. It seems that the giant loves cuckoos. He falls asleep and Secret and Morocco start to climb him to get to the clock. Morocco accidentally wakes the giant and he starts to chase them.
The giant stops when he hears the cuckoo clock and tells them what a beautiful sound it is. Morocco asks why the sound of cuckoo-cuckoo is so nice. The giant likes the way Morocco says it and makes a deal with Secret.
Secret Squirrel returns Big Ben to its rightful place and Morocco plays the part of a cuckoo clock for the giant and hopes that Secret hurries up and gets him out of this situation before he goes cuckoo.