Yvonne didn't want to be working on her birthday, but that all changed when a handsome cycle courier delivered a note from her husband.'The courier is in The Gang. Give him your knickers and he'll tell you how to get them back. T.'Now, she's in a carnal treasure hunt, meeting strangers in underground car parks and woodland clearings, where she'll get to be taken hard and without protection, by complete strangers.Best birthday ever?Possibly.