WHAT a great way to immerse yourself in a whodunnit. This interactive DVD, featuring footage from the recent ITV adaptation of After the Funeral, features linking sequences in which Poirot (David Suchet) challenges players to test their powers of observation.

The aim is to work out who murdered Cora Lansquenet after the reading of her brother's will.

There are chances to bump up scores with a range of beat-the-clock challenges. It's all great fun - particularly when Poirot chides you for scoring badly - but be warned. Playing detective puts pressure on the "little grey cells" so go easy on the Christmas punch if you're inviting friends round to play.