On the trail of the 'African Mona Lisa'

ILE-IFE, Nigeria - She's been described as "the African Mona Lisa", the subject of a long-lost series of three paintings by the artist considered the father of Nigerian modernism.

But like Leonardo da Vinci's most famous portrait, finding out more about the woman in Ben Enwonwu's Tutu has so far been elusive, even for her extensive extended family.

One of the missing works, which was discovered in a north London flat, goes on sale in the British capital on Wednesday and is expected to fetch 250,000 pounds ($349,183).