Catriona Ward

A luxury voyage. An elite guest list. One deadly secret. What's promised to be an idyllic trip turns catastrophic when passengers become prey, and the real monsters aboard won't stay hidden any longer. A famous musician and her peculiar personal assistant, Cara, must navigate increasingly choppy waters with other guests aboard The Solitude, a luxury yacht sailing the Caribbean. With a massive cyclone closing in and the engines suddenly dead, a different kind of danger gathers on deck: a murderer on board, hunting the guests one by one.
But what nobody knows - and what may be their ultimate undoing - is that Cara is the biggest threat to them all.