Airs Tuesday, Apr 22 2014 at 20:00 BST on BBC One
Having reached a bitter impasse with Jonny, Jac sees no option but to make a sickening decision - then is faced with a brutal blast from the past.
Meanwhile, Arthur has some big decisions to make as he plays with the big boys of Neurosurgery.
Elsewhere, has Mo passed up the opportunity of a lifetime?