If Not You follows Mattie French and Campbell Porter, two copywriters who have been professional rivals since their internship days. Their agencies are competing for a luxury resort account, and the pitch requires a month of travel together. That setup forces the pair into prolonged proximity and turns a long-running rivalry into a situation where they must confront what they actually think and feel about one another.
Mattie is presented as a rising copywriter who wants a promotion and sees the pitch as a chance to beat Campbell and prove herself. Campbell is described as talented, confident, and the source of Mattie's competitive edge — the golden-boy smirk that's been a recurring provocation. Their chemistry is built on sharp banter and years of learning how to push each other's buttons. As they travel, those defenses begin to fall away and they notice details they had long ignored.
The novel uses flashbacks regularly. The reviewer appreciated these because they supply context for how the rivalry became entrenched. The present-day timeline unfolds during a month of travel, which creates a clear arc: pitch preparation → travel and shared experiences → final pitch and emotional reckoning. The romance is paced slowly, with yearning building as the characters allow vulnerability to show.
The book combines multiple, specific romance tropes: rivals-to-lovers, workplace romance, forced proximity, slow burn, mutual pining, and a work-trip narrative. The reviewer lists those tropes as central to the reading experience and notes the interplay between professional stakes and personal discovery.
Beyond the central romance, the reviewer mentions career drama, friendships, and family dynamics as part of the broader story world. These secondary elements are presented as supporting layers that add texture to Mattie and Campbell's journey rather than distracting subplots.
The reviewer enjoyed watching the rivalry evolve into attraction, with the slow-burn structure and flashbacks earning particular praise for clarifying motivations. The story is recommended for readers who like workplace competition, long-standing history between leads, and romance that builds gradually through travel and shared work challenges.