A Rogue's Company by Allison Montclair
This is part of the delightful Sparks & Bainbridge series. A man from Africa comes to the marriage bureau to look for a wife. But Gwen thinks he's not telling the truth--then she notices him working as a gardener on her street, which increases her suspicions. Then, while riding in a car with her surly father in law, Gwen (and the father in law) get kidnapped and held for ransom. Family secrets are uncovered. It's a good story. If you're a fan of the series, as I am, you will enjoy this installment.