On a sweltering June day last year, The Dublin-based French Mancel family left their apartment in Leopardstown in south Dublin, headed to Dublin Airport.  

They flew to Reykjavik and checked into the luxury Edition hotel for what seemed like a holiday for Emeric Mancel, his wife Ming Ting and their daughter, Catherine. 

However, on the day they were due to fly home, Emeric and Catherine were found dead in the hotel.  

What happened? 

Ciara is joined by Karen McHugh, a freelance journalist based in Reykjavik