All it takes is a spilt second for everything to change forever.Imogen has always wanted to be a doctor, but the pressure of her job is slowly cracking her fragile mental state; her infatuation with an old flame twisting into something darker.Grace has her hands full as a vet and a harried mother to a recovering anorexic teenager. But when circumstances force her daughter to change school, Grace's carefully-hidden secrets are threatened with exposure.Zoe, a teacher, is blissfully in love with her new boyfriend, but his old school friend, Imogen, still seems to be obsessed with him . . . and now her . . .All it takes is one fateful accident to change all their lives forever. Or was it an accident at all?