Dexter flips the lid after finding his ma and da getting cosy. He doesn't seem at all interested in the fact the the oul fella makes mammy really happy, and ends up doing a Cora, by giving Ava an ultimatum. Meanwhile the coppers are trying to find out who started the fire, so a bumbling Ian is forced to tell Carl that he wasn't the ones who called them in. Bianca's having a coronary while Whitney is questioned, and hair extensions is still trying to win back Max. Why?