Killer Trails Lincoln: The IMPractical Jester

The streets of Lincoln ransacked. A castle guard murdered. And an envelope full of cryptic evidence. Rumour has it that the mischievous imps are back in town! But which little devil is behind these exasperating events? Never have your little grey cells been so puzzled as in this, your most mythical case yet. Can you follow the trail of impish clues, deduce who the culprit is, and put an end to this lunacy? Lincoln is in desperate need of your help, detective!