When he finally achieved his ambition, becoming one of only a dozen full-time undercover officers, the reality of covert work turned his life into a nightmare.To catch criminals, Christian bought and sold drugs with taxpayers' money, was beaten up, arrested at gunpoint and barricaded in a pub by a gang of marauding travellers - all in a day's work. At one stage, he was running almost a dozen mobile phones to keep track of his different identities and had so many aliases that he nearly forgot who he was. He put his life on the line for the job but was to find that being the 'best of the best' wasn't all it was cracked up to be. The pressure became so intense that he even contemplated suicide.Crossing the Line is a visceral, gripping account of what it really takes to be an undercover cop, going behind the scenes to reveal the harsh realities of modern covert police work.