Dead and Gone by LJ Swallow

The dead don’t speak, but the stuffed mole stolen from the museum has a story to tell—one far stranger than its brief Instagram fame.

Thornwood Academy’s dark and deadly detective Violet Blackwood has a new case, but this time she isn’t clearing her name for murder. When the museum’s prized taxidermy mole goes missing, it seems like a harmless prank, until Violet realizes there’s more to Marvin the mole than meets the eye.
With a furious curator blaming local teens, the discovery of mysterious magical artifacts, and whispers of a witch’s involvement, Violet is determined to untangle the real reason behind the mole’s disappearance and discover its whereabouts.
Together with Rowan, Grayson, and Leif, Violet uncovers long-hidden truths about the town’s history. As clues mount and suspects grow bolder, the four must rely on their combined supernatural abilities to solve the case.

When the pieces fall into place, one thing becomes clear: Marvin the mole may be dead and gone, but he’s about to unearth secrets that some would rather keep buried.