Interstitial — Ann Somerville

A sequel to 'Interstitial' (available at Amazon). North and Seb are still fumbling towards happiness, but the baggage they both carry is holding them back. Still, a six month mission on a quiet backwater of a planet could be the making of them...but then Jati has to go and say the fatal words: 'milk run'. She should know by now that nothing is ever that easy - and space is full of surprises.