Buried pirate treasure? The appearance of a time traveler? A mysterious murder? A missing ferret?

A lesser mind than Lyra Heartstrings would treat these as four independent cases, but Lyra knows these things to merely be the four sides of a giant, intricate puzzle; a puzzle that, if she were able to solve, would catapult the reputation of her newly founded holistic detective agency to unknown heights.
A puzzle that, if she would fail to solve, could end up in the complete destruction of the universe – just like always when time travel shenanigans are involved.

A self-proclamed thumping good detective-ghost-horror-who dunnit-time travel-romantic-musical-comedy-pony-epic.