If you liked David Nicholls' One Day...

The Time Traveller’s Wife by Audrey Niffenegger
The bestseller tells the magical tale of a Clare and Henry, the latter of which has ‘chrono displacement disorder’, which results in his being pulled suddenly into either his past or his future.
Clare and Henry have known each other since Clare was six and Henry was thirty-six, and were married when Clare was twenty-two and Henry thirty. Impossible but true, because Henry is one of the first people diagnosed with Chrono-Displacement Disorder: periodically his genetic clock resets and he finds himself pulled suddenly into his past or future. His disappearances are spontaneous and his experiences are alternately harrowing and amusing. The Time Traveler's Wife depicts the effects of time travel on Henry and Clare's passionate love for each other with grace and humour. Their struggle to lead normal lives in the face of a force they can neither prevent nor control is intensely moving and entirely unforgettable.

Juliet, Naked by Nick Hornby
The acclaimed author returns to his roots of music and less-than-neat relationships as he explores how the early promise of a relationship all too often evaporates.
A funny and touching new novel which thoughtfully and sympathetically looks at how lives can be wasted but how they are never beyond redemption. Annie lives in a dull town on England's bleak east coast and is in a relationship with Duncan which mirrors the place; Tucker was once a brilliant songwriter and performer who's gone into seclusion in rural America - or at least that's what his fans think. Duncan is obsessed with Tucker's work, to the point of derangement, and when Annie dares to go public on her dislike of his latest album, there are quite unexpected, life-changing consequences for all three. Nick Hornby uses this intriguing canvas to explore why it is we so often let the early promise of relationships, ambition and indeed life evaporate. And he comes to some surprisingly optimistic conclusions.