Jimmy McGovern, creator of 'Cracker' and 'The Lakes', writes the screenplay for this British thriller. Gary (Christopher Eccleston) is consumed with jealousy, convinced that his wife Tess (Kate Hardie) is having an affair. Obsessed by this possibility of infidelity, Gary suffers a massive heart-attack, which he survives, but is left weak and vulnerable. Whilst Tess slips into the arms of Alex (Rhys Ifans), Gary is revitalised by a heart transplant when he convinces Maria McCardle (Saskia Reeves) to donate the heart of her recently deceased seventeen year old son. However, matters do not end here, as Maria becomes increasingly obsessed with Gary and events spiral out of control.