Heartstrings.

Eight months pregnant and still healing from the chaos Thawne unleashed, Hayley Smith is barely holding her world together. The last thing she expects is to cross paths with Harry Wells, the sharp, brooding scientist who wears too many secrets behind his tired eyes.
After one night changed everything, Hayley's life became entangled with Barry Allen, and now-carrying his unborn daughter-she's fighting to protect both her baby and her heart. But when Harry appears at S.T.A.R. Labs, old wounds reopen. His resemblance to the man who once tried to destroy her trust-Thawne-makes it impossible for Hayley to see him as anything but danger.
Yet as fate pulls them into each other's orbit, Hayley starts to question everything she thought she knew. Because sometimes, the people we fear most are the ones who understand us best... and sometimes, the heartstrings we try to cut keep pulling us back.