The defendant alleged that he was induced to make and execute an agreement to pay the plaintiff various amounts following the breakdown of their 10-year relationship, including: payment of US $50,000 (with US $30,000 to be paid initially followed by the remainder; this was subsequently amended to US $60,000), payment of the plaintiff’s rental and medical expenses for 12 months, the purchase of furniture and a computer, and the provision of financial support to the plaintiff’s daughter who was studying. The defendant freely paid the plaintiff US $30,000 but did not honor the rest of the proposed agreement. The defendant claimed that the agreement had been entered into by duress on the part of the plaintiff or alternatively, should be set aside for lack of consideration, and therefore counterclaimed the US$30,000 paid under that agreement. In reply, the plaintiff claimed that: (i) there was a common law marriage between the parties for the defendant held himself out as the plaintiff’s husband and father to her children and for all intents and purposes they lived as husband and wife; and, (ii) the defendant entered into the agreement willingly. The Supreme Court concluded that, in the present case, there was no celebration of marriage and, therefore, the parties could not be presumed to have been married under common law. Further, the Supreme Court noted that there was evidence in support of the position that the agreement was the result of blackmail on the part of the plaintiff who held various sensitive documents of the defendant and threatened to report the defendant to the Zambia Revenue Authority if he did not agree to enter into the agreement. The Supreme Court noted that the evidence established that the agreement had been entered into under duress and therefore was capable of being set aside on this basis. However, a party who enters into a contract under duress has the option of ratifying the contract or seeking to avoid it once the duress has come to an end. The Supreme Court noted that while the defendant paid the US $30,000 with full knowledge of all the circumstances (including suspecting that the plaintiff no longer had any sensitive documents in her possession), the defendant could not have legally ratified the contract, as it was invalid for lack of consideration (in particular, any consideration would be past consideration because the relationship had ended and the plaintiff was supposed to move out of the defendant’s house anyway as she had no legal right to continue staying there). Accordingly, the Supreme Court ordered the plaintiff to refund US$30,000 without interest to the defendant on the basis that the plaintiff should not be unjustly enriched by the threat (with costs to be borne by the plaintiff, to be agreed upon or taxed in default of agreement).