While taking his daughter to the clinic for a foot injury, a man collapses with chest pains that are later revealed to be symptomatic of a gall bladder condition. But when Kate and Zeke stay late at the clinic to prep him for transport to the hospital, they find themselves staring down the barrel of a gun. A woman they have never met before takes the clinica staff hostage and refuses to let them go - or even let them treat their dying patent - until she speaks to Michael Holt.