Between Waves follows Jamie's journey to join her missing lover, Isaac, in a parallel dimension. Despite Isaac's presumed death, he continues to visit Jamie, urging her to join him. Armed with a map and notebook, she heads to Sao Miguel in the Acores, untangling the truth behind Isaac's disappearance. Burdened by a police investigation and conflicted about her terminated pregnancy, Jamie grapples with Isaac's inter-dimensional calls. When Isaac's former research partner, Renata, arrives, the question lingers: does Renata believe Jamie or seek Isaac's notebook? Balancing on the edge of enlightenment and madness, Jamie explores how far she'll go before it's too much.