Hypothesis Series by Penny Reid

4.14 · 295 ratings
  • Elements of Chemistry (Hypothesis #1-3)
    #1-3

    Elements of Chemistry (Hypothesis #1-3)

    Penny Reid

    Rated: 4.09 of 5 stars
    · Steam rating: 4 of 5
    · 105 ratings · published 2015

    One week. Private beach. Invisible girl. Jerk-faced bully. What’s the worst that could happen? Kaitlyn Parker has no problem being the invisible girl, which is why she finds herself hiding in various cabinets and closets all over her college campus. Despite her best efforts, she can’t escape the notice of Martin Sandeke—bad boy, jerkface bully, and the universe’s hottest, wealthiest, and most unobtainable bachelor—who also happens to be Kaitlyn’s chemistry lab partner... more

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  • Elements of Chemistry: Attraction (Hypothesis #1)
    #1

    Elements of Chemistry: Attraction (Hypothesis #1)

    Penny Reid

    Rated: 4.03 of 5 stars
    · Steam rating: 4 of 5
    · 44 ratings · published 2015

    He is everything she doesn’t want, so why does she want him so badly? From the New York Times Bestselling Author Penny Reid. One week. Private beach. Invisible girl. Jerk-faced bully. What’s the worst that could happen? Kaitlyn Parker has no problem being the invisible girl, which is why she finds herself hiding in various cabinets and closets all over her college campus... more

  • Laws of Physics (Hypothesis #2)
    #2

    Laws of Physics (Hypothesis #2)

    Penny Reid

    Rated: 4.38 of 5 stars
    · Steam rating: 4 of 5
    · 49 ratings · published 2019

    One week. Home alone. Girl genius. Unrepentant slacker. Big lie. What’s the worst that could happen? Mona is a smart girl and figured everything out a long time ago. She had to. She didn’t have a choice. When your parents are uber-celebrities and you graduate from high school at fifteen, finish college at eighteen, and start your PhD program at nineteen, you don’t have time for distractions outside of your foci. Even fun is scheduled... more

  • INHERITANCE (Hypothesis #3)
    #3

    INHERITANCE (Hypothesis #3)

    Penny Reid

    Rated: 4.09 of 5 stars
    · Steam rating: 4 of 5
    · 14 ratings · published 2025

    Sam just received a wedding invitation. . . to her own wedding. Samantha Jarlston doesn’t talk about her past and she has no interest in a long-term romantic relationship with anyone. As a 28-year-old genetics Ph. D. student living in New York City with three roommates and two part-time jobs, Sam doesn’t have much time to do anything other than run sequencing experiments, grade lab reports, and avoid handsy assistant professors... more

  • Elements of Chemistry: Capture (Hypothesis #3)
    #3

    Elements of Chemistry: Capture (Hypothesis #3)

    Penny Reid

    Rated: 4.10 of 5 stars
    · 36 ratings · published 2020

    Part 3 of Elements of Chemistry. One week. Manhattan apartment. Super-hot ex-boyfriend. …What’s the worst that could happen? It’s been nine months since Kaitlyn Parker has seen or heard from Martin Sandeke—nine months and five stages of matter. She’s lived through the worst of first-love heartbreak, and is most certainly stronger (and less likely to hide in science cabinets) than ever before. But now Martin is back. And he wants to be friends... more

  • Inheritance (Hypothesis #7)
    #7

    Inheritance (Hypothesis #7)

    Penny Reid

    Rated: 4.19 of 5 stars
    · Steam rating: 1 of 5
    · 16 ratings · published 2025

    Sam just received a wedding invitation. . . to her own wedding. Samantha Jarlston doesn’t talk about her past and she has no interest in a long-term romantic relationship with anyone. As a 28-year-old genetics Ph. D. student living in New York City with three roommates and two part-time jobs, Sam doesn’t have much time to do anything other than run sequencing experiments, grade lab reports, and avoid handsy assistant professors... more

  • Reproduction (Hypothesis #8)
    #8

    Reproduction (Hypothesis #8)

    Penny Reid

    Rated: 4.23 of 5 stars
    · Steam rating: 3 of 5
    · 16 ratings · published 2025

    Sam keeps sleepwalking . . . and waking up in the wrong bed. Samantha Jarlston keeps telling herself she doesn’t want to get romantically involved with her former childhood best friend and current partner in crime, the very sexy chess grandmaster, Andreas Kristiansen. But despite her many, many, MANY protestations, Sam keeps waking up in Andreas’s bed. Even worse, he’s adorably flustered and shy about it. Every. Single. Time... more

  • Evolution (Hypothesis #9)
    #9

    Evolution (Hypothesis #9)

    Penny Reid

    Rated: 3.98 of 5 stars
    · Steam rating: 4 of 5
    · 15 ratings · published 2025

    Sam has to make a decision, and either way she’s going to lose. Samantha is still reeling from her discovery about Andreas and is questioning everything she thought she knew about her former best friend. Before she can figure out what to do, Sam makes another shocking discovery, this time about what really happened between her father and the Kristiansens over fifteen years ago. Sam is faced with two impossible decisions. Unfortunately, no matter what she decides, she’s going to lose... more

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