Two housing scheme boys dream up a plan to steal priceless antiques from a nearby stately mansion... antiques that are designated for the Burrell Museum and have been stored in packing crates for decades. It's a plan that grows with them through their adolescent scrapes and battles. But one of them is really after the masterpiece portrait that hangs in the mansion house library. It obsesses him because it reminds him of his mother, at her happiest...