Grace Trevethan's idyllic life on the Cornish coast is turning upside down. Faced with her husband's untimely death, a mountain of debt, a former mistress and the prospect of losing her beautiful manor house, Grace decides to put her green fingers to work. Desperate times call for desperate measures and with a little prompting from her now underemployed gardener, Matthew, Grace swaps her prize-winning orchids for... marijuana. Together, they convert her state-of-the-art greenhouse into what she hopes will be their goldmine and salvation. Valuable as marijuana is, it's not a currency the bank recognises. So, Grace leaves the safety of her Cornish village to sell her produce to the menacing underworld of London's Notting Hill. The pressures of her new-found enterprise begin to catch up with her, as gangsters, debt collectors and the police are in hot pursuit.