I was intrigued by the premise of this twisty thriller: a travel writer takes an assignment aboard an exclusive luxury cruise ship. Shortly after arriving, she wakes in the middle of the night to the sound of something heavy being thrown overboard. She's sure it's a body ... and yet no one is missing from the boat. She's compelled to figure out what really happened, which puts more than her own life in danger. Strongly reminiscent of Agatha Christie's And Then There Were None.

From the publisher: "On a cool June morning, a woman is walking her dog in the idyllic coastal village of Salten, along a tidal estuary known as the Reach. Before she can stop him, the dog charges into the water to retrieve what first appears to be a wayward stick, but to her horror, turns out to be something much more sinister. The next morning, three women in and around London—Fatima, Thea, and Isa—receive the text they had always hoped would never come, from the fourth in their formerly inseparable clique, Kate, that says only, 'I need you.' The four girls were best friends at Salten, a second-rate boarding school set near the cliffs of the English Channel. Each different in their own way, the four became inseparable and were notorious for playing the Lying Game, telling lies at every turn to both fellow boarders and faculty. But their little game had consequences, and as the four converge in present-day Salten, they realize their shared past was not as safely buried as they had once hoped."

From the publisher: "Harkening to Agatha Christie’s classic And Then There Were None, this high-tension thriller follows five couples trapped on a storm-swept island as a killer stalks among them—from Ruth Ware, the New York Times bestselling author who “is turning out to be as ingenious and indefatigable as the Queen of Crime” (The Washington Post). Lyla is in a bit of a rut. Her post-doctoral research has fizzled out, she's pretty sure they won’t extend her contract, and things with her boyfriend, Nico, an aspiring actor, aren't going great. When the opportunity arises for Nico to join the cast of a new reality TV show, One Perfect Couple, she agrees to try out with him. A whirlwind audition process later, Lyla finds herself whisked off to a tropical paradise with Nico, boating through the Indian Ocean towards Ever After Island, where the two of them will compete against four other couples—Bayer and Angel, Dan and Santana, Joel and Romi, and Conor and Zana—in order to win a cash prize. But not long after they arrive on the deserted island, things start to go wrong. After the first challenge leaves everyone rattled and angry, an overnight storm takes matters from bad to worse. Cut off from the mainland by miles of ocean, deprived of their phones, and unable to contact the crew that brought them there, the group must band together for survival. As tensions run high and fresh water runs low, Lyla finds that this game show is all too real—and the stakes are life or death."