When distinguished botanist J. W. Heslop Harrison established an enviable reputation for discovering new types of plants and insects in the Hebrides, the botanical establishment was first admiring and then incredulous. The discoveries supported a pet theory of Heslop Harrison's that some plants still survived in the British Isles from before the ice age. But were Heslop Harrison's discoveries genuine? As suspicion grew, a keen amateur botanist, John Raven, secretly investigated Heslop Harrison's findings. Despite Raven's conclusions pointing to fraud, they were never made public. Why, if there was so much suspicion surrounding Heslop Harrison, did he carry on his work unchallenged?