The Rachel Incident.  I rolled my eyes at the title at first, but once I’d read the climactic scene, it suddenly became a perfect fit.  This is the hilarious and heartfelt story of platonic soulmates, and the writing is so fast-paced and witty that I never wanted to put it down.  With undeniable humor leading the way, O’Donoghue joins the intricate character relationships of Sally Rooney with the harsh realities of late aughts/early 2010s Ireland—recession, barriers to reproductive care, homophobia.  This book is so good it makes me want to squeal and do a little dance and also read everything else Caroline O’Donoghue has written.