Dr. Merrick faces a testing time when a terrified hospital patient claims her husband is trying to kill her, but Merton seems reluctant to get involved, while Vernon picks up a bargain all-purpose pest-control solution, enlisting David's help in his eradication mission. Gina's cousin Diane arrives to help her and Phil with the wedding preparations - much to the delight of PC Crane, who's instantly smitten.
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