Jac is back at Holby and out to prove she can be a good leader, she bites her tongue and accepts the offer of mentoring new registrar, Sahira through her first day. But when Sahira proves not only is she a match for Jac but has history with Hanssen, Jac realises all may not be what it seems. Jac knows she has competition - but there's nothing she likes better - bring it on!