Oliver Valentine returns to Holby, but he is not in a good way having been attacked by a group of youths outside the hospital. Once inside, Jac and Elliot treat him for chest pains, caused by Chagas disease. Elliot realises Oliver needs an operation – although it is made tricky when he discovers Oliver is also suffering from cirrhosis of the liver. Determined not to let this discourage him, Elliot decides to push ahead and use his new device, despite Jac's refusal. Later, Jac allows him to use the device, even suggesting he calls it Kibo. The operation is a success. Meanwhile, Ric returns to AAU, but is shocked to learn Amy has handed in her resignation. Guy struggles to accept Zosia may never be the same again.