The Fault In Our Stars by John Green:

Despite the tumour-shrinking medical miracle that has bought her a few years, Hazel has never been anything but terminal, her final chapter inscribed upon diagnosis. But when a gorgeous plot twist named Augustus Waters suddenly appears at Cancer Kid Support Group, Hazel’s story is about to be completely rewritten.

Insightful, bold, irreverent, and raw, The Fault in Our Stars is award-winning author John Green’s most ambitious and heartbreaking work yet, brilliantly exploring the funny, thrilling, and tragic business of being alive and in love.

Zac & Mia by A. J. Betts:

The last person Zac expects in the room next door is a girl like Mia, angry and feisty with questionable taste in music. In the real world, he wouldn’t—couldn’t—be friends with her.

In hospital different rules apply, and what begins as a knock on the wall leads to a note—then a friendship neither of them sees coming.

You need courage to be in hospital; different courage to be back in the real world. In one of these worlds Zac needs Mia. And in the other Mia needs Zac. Or maybe they both need each other, always.