The Opportunist, written by Tarryn Fisher, is a contemporary romance novel that introduces Caleb Drake, a possessive and manipulative man. The story follows the complicated relationship between Caleb and Olivia Kaspen, who find themselves entangled in a web of lies and deceit. Caleb's controlling nature and his ability to manipulate others drive the narrative, as Olivia tries to navigate their toxic connection. The book explores themes of betrayal, obsession, and the consequences of past actions.