Tilly and Thandeka are two friends with a talent for solving mysteries. They know that having adventures means sticking together, thinking on your feet, being brave even if you are scared and most importantly, trusting your instincts when you meet someone suspicious.Their second adventure takes them into the amazing world of butterfly collecting at the Coastal Museum and becomes a race against time to save a rare butterfly. They quickly figure out that there is a spy in their midst, but what if no one else believes them?