A Rogue's Company by Allison Montclair

When Gwen's father-in-law Lord Bainbridge returns from Africa and insists that her son, Ronnie, be sent to boarding school, she knows she has a battle on her hands to keep Ronnie in London. Gwen lost guardianship of Ronnie after she spent time in an asylum after the death of her husband, so she cannot make independent decisions about Ronnie's upbringing. It seems that Lord Bainbridge's business dealings haven't been successful of late, leading to a kidnapping and other crimes. Could Gwen's and Iris's latest client Simon Daile at the Right Sort Marriage Bureau somehow be involved? A Rogue's Company is the third book in Sparks and Bainbridge series set in post World War II England, and is such a pleasure that it's hard to wait a year for the next book in the series.