*I received a copy of this book on NetGalley in exchange for an honest review. Thank you to the author, publisher, and NetGalley for this opportunity.*

In THE THEORY OF (NOT QUITE) EVERYTHING, siblings Art and Mimi Brotherton have been caught in the never ending, monotonous loop of life. Every week happens just the same as the week before, and that's how it's been in the years since the tragic double suicide of their parents. Art, a genius mathematician focused on solving the infamous "p versus np", is posed with the most serious problem of his illustrious career-- helping his sister find love.

Mimi, who had resigned herself to being her brother's caretaker for the rest of her life, has decided she doesn't necessarily have to do it alone. But a chance encounter with on of Art's fellow mathematicians may throw the entire, carefully planned, algorithm right out the window.

The story that follows shows what it's like to suffer side by side, but still be alone. And what it takes to break down those barriers.

Overall, the story took a while to get into-- the switching POVs were not clearly marked and made it difficult to fully engage while reading. However, the ending was truly satisfying and brought everything back around. The characters are well developed and well written, and it was easy to relate to Mimi and Art.

This book is a good choice for fans of The Kiss Quotient and The Rosie Project, or anyone looking for a familial book that involves a little bit of math, love, and mystery.