The Riddle Mural is in the Round Room of Port Eliot House in St Germans, Cornwall.

The mural was painted by Lenkiewicz over a period of 30 years and is some 40 feet in diameter. The work is unfinshed.

The mural is in two halves. One half depicts death, destruction, insanity, unrequited love, and the apocalyptic end of the world, whilst the other reflects love and affection, friendships, harmony, proportion and consensus. Within the overall picture are concealed various references to family skeletons, art history and cabalistic mysteries making for what Lenkiewicz called this work, ‘The Riddle Mural’.