A Stolen Child by Sarah Stewart Taylor

In the last book of the Maggie D'Arcy series, Maggie is finally a policewoman in Ireland--starting at the bottom doing community policing in Dublin. Maggie and her partner, Jason, are involved in a domestic disturbance that turns into murder. A young woman named Jade is killed and her two-year-old daughter, Laurel is missing. With the Garda being shorthanded, Maggie is given special permission to work on the case. Everyone is on edge, desperate to find Laurel. Those who knew Jade aren't very forthcoming with the authorities, so it's tough to move the case forward. Will Maggie and her colleagues be able to bring Laurel home safe and find justice for Jade?