Publisher's Synopsis
Chris and Andy are going on holiday to visit their grandparents on the Scottish island of Shamway - without their parents to spoil their fun!
But as they explore the islands in a boat with their Grandad, the inhabitants of one particular island capture Chis, Andy and their Grandad. Can the trio escape their captivity?
With evidence of their captor's crimes hidden in an ingenious place and someone about to walk the plank, will justice be served?
But just where did they hide the evidence?
