The Theory of (Not Quite) Everything by Kara Gnodde

Bound together by their parents’ tragic death, devoted siblings Mimi and Art have different ideas about everything – most recently, how Mimi should find love.

Mimi believes that love is more than just a numbers game. Art, a maths genius, thinks people are incapable of making sensible decisions, especially about romance. That’s what algorithms are for.

So, when Mimi meets someone, Art starts looking for a glitch. Because something doesn't add up and Art fears he's in danger of losing his sister forever . . .