Comprehensive Study Notes: Not in Love by Ali Hazelwood

Trauma and Healing: Central characters Rue Siebert and Eli Killgore grapple with profound past traumas. Rue’s history involves severe food insecurity and parentification, while Eli dealt with the sudden loss of parents, financial ruin, and the burden of raising a younger sister. Their connection is defined by the exchange of "terrible, secret stories" as a form of emotional currency.
Trust and Betrayal: The plot hinges on intellectual property theft. Florence Kline, Rue’s mentor and friend, is revealed to have stolen the foundational biofuel technology from her former students: Eli, Hark, and Minami. This creates a conflict of loyalty for Rue when she falls for Eli.
Control and Surrender: The physical relationship between Rue and Eli serves as a microcosm for their internal struggles. Both characters find safety in surrendering control to each other, contrasting their highly controlled professional lives.

Rue Siebert: A chemical engineer specializing in food nanotechnology (shelf-life extension). She is socially anxious, brilliant, and protective of those she loves. She grew up in Salado, Texas, and was a competitive figure skater.
Eli Killgore: A founding partner at Harkness Group, a private equity firm. A former college hockey player for St. Cloud State, he is described as having a "Grecian urn profile" and a "man's man" persona. He is deeply protective of his sister, Maya.
Florence Kline: CEO and founder of Kline. A charismatic but morally ambiguous mentor. She prioritized her personal career survival over the academic contributions of her students, leading to the central conflict.
Tisha Fuli: Rue’s best friend since elementary school and a fellow scientist. She provides emotional grounding and serves as a reality check for Rue throughout her relationship with Eli.
Minami Oka: A partner at Harkness and a brilliant scientist. She was the intellectual lead on the biofuel tech stolen by Florence. Her character bridges the gap between revenge and reconciliation.

The Biofuel Patent: Originally developed by Minami, Eli, and Hark under Florence’s supervision at UT Austin. Florence claimed sole ownership to secure industry funding, leading to the students' expulsion from their PhD program.
The Loan Assignment: Harkness Group buys Kline’s debt from another lender to gain access to the company and the patent. This is a "loan-to-own" strategy motivated by a mix of financial sense and ten-year-old revenge.
The Microbial Coating Patent: Rue’s life work. Florence attempts to sell this asset to NovaTech (a competitor) to raise funds and pay off Harkness, despite having a (non-binding) contract with Rue promising her ownership.

The App Match: They originally meet through a sex-forward dating app with a strict "no repeats" rule.
The Confrontation: Rue discovers Eli is the "enemy" at a company assembly. This leads to a cycle of intense sexual attraction mixed with professional hostility.
The Deposition Discovery: Rue finds a legal transcript in Eli's car proving Florence’s prior connection to the Harkness partners, exposing Florence’s lies.
The Grand Gesture: Eli prioritizes Rue’s career over the ten-year revenge plot. He negotiates a deal where Harkness forgives Kline’s loan in exchange for Rue retaining her patent rights, even though it costs Harkness total control of the company.

Food Nanotechnology: The application of nanomaterials to food science. Rue’s project involves a polysaccharide-based coating (chitosan and lactobacillus) to minimize postharvest loss.
Hydrolysis and PH Saga: Specific chemical engineering processes mentioned in relation to the scale-up of biofuel production.
Insolvency Clauses: Legal terms in the loan contract that allow a lender to take equity or ownership if the borrower cannot meet financial obligations by the end of the quarter ( $Q2$ , June 30th).