Who do you choose when the cracks begin to show? When Lena buys DNA testing kits for her father Tom and twin sister Alison, she has no idea the gift will blow her family apart. Tom, forced to admit that he isn’t his daughters’ biological father, is terrified they will reject him. Alison, trying to start a family with her wife, doesn’t think DNA should make a difference.

But Lena is obsessed with tracking down their biological father – and soon discovers they have a famous half-brother. Then she becomes obsessed with him, too… 

‘Funny, poignant, smart and wonderfully, achingly real’ SARAH WATERS

‘Rambunctiously funny’ THE TIMES, Book of the Year

'I can’t think of another author who can make me ricochet so quickly from painful empathy to helpless laughter' ERIN KELLY