Lynn Shelton's Your Sister's Sister was hailed as one of this year's best films at the Tribeca Film Festival, and it is a no-brainer as to why.

This romantic comedy is funny, but not necessarily in a laugh-out-loud way. Instead, it's a steady kind of funny that will keep you amused from start to finish. It's not your typical romantic comedy, either - the movie takes a deeper, darker and more poignant turn at times. It's definitely not all about the laughs here.

From the outset, Shelton's film is incredibly simple - three characters on an island with a basketful of conflicting emotions. This set-up may seem quite boring but don’t be fooled: the 'simple' plot is enhanced by fantastic characters, excellent acting and extremely honest, realistic and relatable relationships and themes.

The movie revolves around Jack (Duplass), Iris (Blunt) and Hannah (DeWitt). A year after his brother's death, the wrecked-but-endearing Jack (Duplass) has failed to come to terms with the loss. After a drunken slur and display at a memorial for his brother, Jack is forced to leave town and get his act together, following a one-to-one intervention staged by his best friend and brother's ex Iris (Blunt).

Jack heads to Iris' father's cabin on an island - away from all distraction - so he can just think. However, when he arrives at the cabin Iris' sister Hannah (DeWitt) is there, having retreated to the island to seek solace after walking out of a seven-year relationship. The pair drink tequila, get drunk, share their woes and inevitably end up having a one-night-stand. To everyone's surprise and bewilderment Iris arrives the next morning and the pair are forced to cover up their night together.

This version of events may sound typical, but trust me, the film is not. To say more would be to risk revealing too much - there are a good few twists and turns.

This is a quality film with top class acting from a perfectly chosen cast. A negative for some, however, will be the cliffhanger ending. I gasped, although I also understand why Shelton chose such an ending. She not's trying to give you a complete story; her film is about real life and relationships between brothers, sisters, friends and lovers - all aspects be they good, bad or painful.

Everyone should be able to relate to a part of this film, whether it is death, grief, love, anger, acceptance or something within the three complex characters.

Recommended.

Nicky O'Flanagan