The Lady's Courtship: A Second Chance Regency Romance - C K MacKenzie

Betrayed by her childhood love, she vowed it would never happen again.
Three years ago, Savannah Shaw was happily in love with her childhood sweetheart-until he abandoned her, leaving her a broken, sobbing mess. But she is nothing if not resilient, and she spent the three years of his absence as a midwife, helping London's less fortunate women. Never again will she let anyone close enough to crush her heart and soul. Especially not her former lover.
Three days ago, she witnessed a murder.
Tristan Conrad spent his life living up to his family's name and his older siblings' exploits. He wanted to forge his own path, experience all the adventure, espionage, and voyages around the world he could. In the process, he ended up hurting the only woman he's ever loved and missing the one thing that inspired him. Maybe he should have expected his return to London to be met with that slap.
She doesn't want his help, but her options are limited.
Someone is murdering London's poor women, and she intends to stop them. Asking Tristan for help isn't the hardest thing she's ever done. That was watching him leave.
Burying memories of their past, she won't make the same mistake twice. The problem is, they work well together-too well. Though Savannah might be able to forgive him, she can never forget the pain of his abandonment. When she finds herself the target of the murderer, Tristan will do everything in his power to protect her.
But will it be enough to win her over again?