Who is Christopher Wren in the play, The Mousetrap?

Christopher Wren is the first guest to arrive. He is described as a wild-looking neurotic young man; his hair is untidy and long. Wren is also quick to confide and child-like. He also has a knowledge of and appreciation for fine furniture. Wren is friendly and likes to cook. But he is also nosy and prone to gossip, reflecting his interest in people. Wren claims to be an architect and to have been named after the seventeenth-century architect, Christopher Wren by his parents in an effort to promote an interest in architecture. He sings nursery rhymes at odd moments during the play. Wren arrives with a suitcase so light that Giles thinks it is empty. After Mrs. Boyle is murdered, Wren is quite distraught and convinced that Trotter will try to pin both murders on him. Later, he discloses that Wren is not his real name and that he is not an architect.