Phil and Penny were made for each other - the only problem is they are married to other people. When they meet at a Tai Chi class they quickly realise the depth of one another's loneliness and need for a sympathetic ear. Fearful of the consequences of growing too close, they go to elaborate lengths to avoid each other. But their paths begin to cross with chance-defying regularity, pulling them ever more deeply into one another's confidence. Is this evidence of a mysterious power at work, or should they simply have an affair? obooko.