Essex, 1983. Meet Vincent Swan, double-glazing salesman extraordinaire. Smart, handsome and cocksure, Vincent will stop at nothing to get a sale. His team at Cachet Windows include Fitzpatrick, a smarmy reprobate who can charm the life savings out of anyone, and Lavender, a failed musician whose crippling politeness and moral backbone have a habit of getting in the way of a sale. The two take a bet on whether Fitzpatrick can ‘sell ice to the Eskimos’ – in other words, sell new windows to someone he has recently sold new windows to. Meanwhile, Vincent’s attempt to convince an old colleague to join the double-glazing business takes an unexpected turn.