Dr Theo Bell is the colleague everyone can rely on. He takes the extra shift, fixes the broken plan, and never asks anyone to rearrange a life for him. Being easy to choose has always felt safer than asking to be chosen. Consultant cardiologist Rhea Kelynack has built her life around a different rule: love must never become a contest. After becoming guardian to her teenage niece, Mari, she ended a relationship that tried to turn family into a hierarchy. She will not make that mistake again. When Theo and Rhea are asked to build Penhaven's new maternal-cardiac pathway, their different instincts should clash. Instead, professional challenge becomes trust-and trust becomes attraction. As they care for a pregnant woman with congenital heart disease whose changing symptoms force the team to keep revising the safest plan, Theo and Rhea find the same question following them home: can one person matter urgently without everyone else mattering less? But Theo's habit of hiding what he wants and Rhea's instinct to hear every request as a demand for first place may cost them the one relationship neither of them expected to risk. The Heart Between Decisions is a warm, emotionally grounded medical workplace romance set in Cornwall, with competence attraction, forced proximity, a guardian heroine, slow-burn tension, steamy closed-door intimacy, and a complete HEA.Book 4 in the CORNWALL MATERNITY UNIT Series.Interconnected standalones. New couple in every book. Best enjoyed in order.