Calder and his sisters have been searching for Jason Hancock for decades. He is responsible for the death of their mother and they are desperate for revenge. When they finally find him and his family, they devise a plan to get Hancock out into the water once Calder gets close to one of his daughters, either Lily or Sophie. Originally planning to use Sophie, Calder changes his mind to Lily after seeing the bond between her and Hancock.
Anne is a talented writer using both clear descriptions and engrossing main characters. I wish the secondary characters had a bit more depth to them as they all seemed a bit flat and, for some of them, I didn't really see their importance. They were just kind of . . . there.
The romance doesn't become a factor until closer to the end of the novel. What I enjoy about this romance is that Lily doesn't immediately fall for Calder. She knows there is something off about him and avoids him, trusting her gut and not falling for the creepy stalker. It takes him a while to gain her trust, even after he proves it to an exceptional degree.
Lies Beneath is dark. These mermaids are out for revenge, for blood, and their own personal brand of justice. Anne's take on mermaid mythology is wonderfully different. She explains that ever gnawing question of just how mercreatures are born, gives them the ability to walk on land while giving them the need to be in water, and gives them the perfect mix of beauty and danger.