Hypothesis Series by Penny Reid, Fiona Fischer

4.12 · 188 ratings
  • Elements of Chemistry: Attraction (Hypothesis #1)
    #1

    Elements of Chemistry: Attraction (Hypothesis #1)

    Penny Reid

    Rated: 3.92 of 5 stars
    · 26 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 ReidOne 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

  • Elements of Chemistry: Heat (Hypothesis #2)
    #2

    Elements of Chemistry: Heat (Hypothesis #2)

    Penny Reid

    Rated: 4.00 of 5 stars
    · 24 ratings · published 2015

    It’s too late to turn back now . . . From the New York Times Bestselling Author Penny ReidFour days left.Private beach (…and boat).Not so invisible girl.And maybe less of a jerk-faced bully than originally thought.What’s the worst (or the best) that could happen?Kaitlyn is finding life outside of the science cabinet of obscurity to be quite illuminating …and so are her pants... more

  • Capture (Hypothesis #3)
    #3

    Capture (Hypothesis #3)

    Penny Reid

    Rated: 4.08 of 5 stars
    · 24 ratings · published 2015

    He broke her heart, and now he’s back . . . From the New York Times Bestselling Author Penny ReidOne 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... more

  • Elements of Chemistry (Hypothesis #1-3)
    #1-3

    Elements of Chemistry (Hypothesis #1-3)

    Penny Reid

    Rated: 4.17 of 5 stars
    · 18 ratings · published 2015

    This is the bundled version of the 'Elements of Chemistry' trilogy and includes parts 1-3 (ATTRACTION, HEAT, and CAPTURE) ATTRACTION (45k words) 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

  • Motion (Hypothesis #4)
    #4

    Motion (Hypothesis #4)

    Penny Reid, Fiona Fischer

    Rated: 4.11 of 5 stars
    · 18 ratings · published 2019

    Forced to lie to protect her sister . . .From the New York Times Bestselling Author Penny ReidOne 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... more

  • Space (Hypothesis #5)
    #5

    Space (Hypothesis #5)

    Penny Reid

    Rated: 4.28 of 5 stars
    · 18 ratings · published 2019

    One week.Private cabin.Famous physicist.Still an unrepentant slacker (but now also very, very angry).What's the worst that could happen?All she wants is forgiveness, and all he wants is revenge . . .From the New York Times Bestselling Author Penny ReidMona's meticulously planned allotment of relaxation is thrown into chaos by the unscheduled appearance of her older brother's band of friends, including the one person she'd hoped to never face again... more

  • Time (Hypothesis #6)
    #6

    Time (Hypothesis #6)

    Penny Reid

    Rated: 4.17 of 5 stars
    · 18 ratings · published 2019

    From the New York Times Bestselling Author Penny ReidA (brokenhearted) physicist.Now an infamous (who is LITERALLY EVERYWHERE!! UGH!) musician.The worst has already happened. Mona has learned that she has nothing figured out and plans are meaningless. After leaving her in Aspen, Abram is now breaking sales-records, rising to rock star fame almost overnight. Mona can’t seem to escape him. He is literally everywhere, or at least images of him are... more

  • Laws of Physics (Hypothesis #4-6)
    #4-6

    Laws of Physics (Hypothesis #4-6)

    Penny Reid

    Rated: 4.40 of 5 stars
    · 10 ratings · published 2022

    Laws of PhysicsPart of the Hypothesis series

  • Inheritance (Hypothesis #7)
    #7

    Inheritance (Hypothesis #7)

    Penny Reid

    Rated: 4.17 of 5 stars
    · 12 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: 4.30 of 5 stars
    · 10 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: 4.10 of 5 stars
    · 10 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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