John Theodore Tussaud

The idea of spending a night alone in the Chamber of Horrors became so popular that it developed its own mythology.

John Theodore Tussaud, Marie's grandson, discussed the rumour in his book, The Romance of Madame Tussauds, published in the early 20th century.

He described a persistent story that the museum would offer a reward to anyone willing to spend the night alone among the wax criminals.

The supposed reward varied wildly in the telling.