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Crawlers (edition 2010)
by Sam Enthoven
Crawlers by Sam Enthoven
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Ben is on a school trip. So is Jasmine. What they don't know is that not everybody in the theatre is there to watch the play and, in fact, they'll never get to see it . . . There is panic at the Barbican when the fire alarms start wailing, but the strangely silent theatre staff, trap them inside the building rather than letting them out to safety.
(summary from another edition)