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Ned, Chuck and Emerson search for a missing teen, Nikki Heaps (guest star HAYLEY McFARLAND - "Gilmore Girls," "ER"), who has run off to the circus ... a circus where people keep turning up dead. Meanwhile, overcome with guilt, Lily pays Olive a visit at the nunnery. Recurring guest star DIANA SCARWID ("Wonderfalls," "Truman" "What Lies Beneath") appears as Mother Superior.