The Doctor's Bride by Sunrise (Brides of Penhally Bay Book 3)

Adam Donnelly has arrived at the Penhally Bay practice hoping to see more of his childhood sweetheart, paramedic Maggie Pascoe. Adam knows he's got a lot of explaining to do if he wants Maggie for his bride, but before they can even hope to resolve their past, the present intervenes in a dramatic way....

Some children have tumbled into in an old Cornish mine, and in the rescue attempt Maggie has become trapped herself. The only one who can save her is the man who once broke her heart. Now Adam has a final chance, and only a few short hours, to show Maggie that he's always loved her more than any other.