The Ocean’s Roar by Keira Blackwood

Mates, Mermaids, & Murder.
Cats and water don’t mix. Tigers aren’t meant to be dragged to the bottom of the sea, even if it’s to solve a murder. But that itch to claw my way to thesurface—it’s blown away by an entirely different desire.
She has unearthly silver hair and violet eyes…not to mention the tail of a fish. But my tiger roars to claim this mermaid, fins and scales and whatever else comes along with her. We come from different worlds, but fate forces us together.
If we can’t solve this murder, there will be war. If we don’t hurry, I’ll lose her forever.