Giselle endures in the collective imagination as a charming, sorrowful, supernatural love story. Premièred in Paris in 1841, this keystone romantic ballet concerns a peasant girl whose trust in a disguised nobleman destroys her fragile mind and heart. Little wonder, given the ballet’s mixture of sunniness, deception, spooky woe and redemption, that it retains a timeless grip or that the title role has become the ballerina equivalent of Hamlet.