We have 20 pairs of tickets to give away to an exclusive preview screening of Dark Waters, which stars Mark Ruffalo, on February 18 in Dublin.

Inspired by shocking true events, Dark Waters tells the story of tenacious attorney Rob Bilott (Ruffalo), who uncovers a dark secret that connects a growing number of unexplained deaths due to one of the world's largest corporations.

In the process, he risks everything - his future, his family, and his own life - to expose the truth.

 Anne Hathaway, Tim Robbins and Bill Pullman also star in the murky tale. 

Thanks to Entertainment One, we have 20 tickets up for grabs to an exclusive screening of Dark Waters on February 18, at 7.00pm in Cineworld, Dublin. 

To be in with a chance of winning, send your answer to the following question to entertainmentonline@rte.ie with "Dark Waters" in the subject line. Please include your name and contact details. 

Who does Mark Ruffalo play in Dark Waters?

a) Mark O'Brien

b) Rob Bilott

c) Seán Keane

This competition will close on Thursday, February 13, 2020, at 1.00pm. The editor's decision is final and no alternative prize can be offered. A guest list will be in operation on the night and you may be required to show ID.

Click here for full RTÉ competition rules