A grief-stricken Serena returns to work looking for answers, but when she doesn't find what she's looking for, her focus soon turns to retribution. Meanwhile, Dominic is left devastated when Isaac returns from his work conference and reveals he cheated on him. However, through the day, Dominic is reminded of his old life and fears about not being good enough for love resurface.

This leads Dom to make a questionable decision to protect their relationship. Elsewhere, Ollie freaks out when he finds an engagement ring in a box apparently deemed as tat by Zosia. However, with time he reconsiders his options - just as Zosia reveals the box is not in fact tat, but her most treasured possessions. Are the couple ready for marriage?. Airs Tuesday, 31 Jan 2017 at 20:00 GMT on BBC One. Share your thoughts, leave a comment in the section below.