After a lad's holiday to Thailand ends with one of the group disappearing, it leads to a twenty-year mystery to discover whatever happened to their friend, Peter Simmonds.

After a school reunion brings the remaining three friends back together they set about finding the real reason for his disappearance. With the help and support of one of the wives, they slowly uncover the truth as to why he disappeared, sending them back to Thailand to unravel the mystery.