That was my challenge idea! Glad you like it however IO changed it too much so it lost its meaning. The point was to turn the Carlisles into unicorns. 
Challenge Name: MYSTERY OF THE UNICORNS
Picture: The Unicorn Horn in the Hidden Room
Mission: Death in the Family - Dartmoor
Requirement:
-Collect the four Unicorn Horns
-Eliminate Alexa, Rebecca, Emma, and Patrick with thrown Unicorn Horns
Reward:
Unicorn Horn
Description/Explanation/Comments:
Find the missing Unicorn Horns and generously donate them to the Carlisle Family.