Tim's quiet holiday in Wales, with his parents and his best friend Biscuits, unexpectedly becomes truly terribly adventurous. An encounter with two local bully-boys threatens to disrupt Tim and Biscuits' fun but their friendship is also threatened by the arrival of Tim's ebullient friend, Kelly. Tim tells the story in snappy prose punctuated with revealing, illustrated extracts from his and Biscuits' holiday diaries.