Tv presenter wife visits aunt to fake dead husband's death return trip.

Tv presenter has an abusive husband who was a tv show writer, and thinks of ways to kill him so it will look like an accident.

He ends up accidentally dying and she convinces her new friend and friends crush who is also an actor to come with her to visit her aunt who has never met the husband. So that way they can use the actor to pretend to be the husband and to fall over board, so it seems like the 'husband' fell overboard and died (on way back from visiting the aunt).
There is also the husbands mistress following them (unaware of what is actually happening) after finding out the husband was lying about who he was and that he is actually married to a famous tv presenter in hopes to blackmail her.