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?