Liam Taggart & Catherine Lockhart Books in Order

The Liam Taggart & Catherine Lockhart novels follow a Chicago‑based husband‑and‑wife team: Liam, a private investigator with roots in Northern Ireland, and Catherine, a determined trial lawyer. Each book gives them a new client whose present‑day legal problem is tied to buried events from the Second World War, pulling them from modern courtrooms into archives, witness statements, and long‑shadowed crimes.

The stories usually open in the present—at a fundraiser, a law office, a small restaurant—when someone asks for help. As Liam and Catherine investigate, the narrative widens into an earlier era, often through the voice of a survivor. The switching timelines drive the mystery: can they prove what really happened before courts, bureaucrats, or dangerous opponents shut the case down?

In Once We Were Brothers, Catherine is urged to sue a celebrated Chicago philanthropist after elderly Ben Solomon insists the man is actually a former Nazi officer who once lived in his Polish home as a foster son. Liam’s investigative work and Ben’s memories carry the story, establishing the tone for the series—part legal thriller, part historical reckoning, with identity and betrayal at the center.

Saving Sophie takes them into a case that crosses from Chicago boardrooms to the West Bank. Jack Sommers is accused of embezzling millions and disappears just as his young daughter is taken by her influential grandfather. Liam and Catherine must untangle missing money, custody battles, and a potential terror attack, showing how today’s conflicts are tied to older political and personal wounds.

In Karolina's Twins, they meet Lena Woodward, a Holocaust survivor determined to fulfill a seventy‑year‑old promise to a friend who died in the camps. Lena wants to search for two infants lost during the war, while her son sues to take control of her affairs, insisting her memories cannot be trusted. The book explores how families handle secrets survivors have carried for decades.

The Trust turns the spotlight on Liam himself. He returns to Northern Ireland for his uncle Fergus’s funeral and finds a will that withholds the estate until the killer is found. Investigating the death forces Liam back into a world of sectarian grudges, paramilitary ties, and family resentments he thought he had left behind, adding a more personal layer to the overarching story.

Later novels widen the map again. In The Girl from Berlin, a dispute over a Tuscan vineyard leads Liam and Catherine to a handwritten memoir by a Jewish violin prodigy in 1930s Berlin. Defending Britta Stein brings them a ninety‑year‑old woman charged with defaming a Danish‑American war hero, pushing the pair deep into Denmark’s occupation history to learn who actually resisted and who collaborated. Across these cases, the books blend travel, legal puzzles, and emotional testimony.

Throughout the series, readers can expect deliberate pacing rather than nonstop action, a focus on ordinary people caught in extreme circumstances, and endings that look for some measure of justice even when full justice is impossible. Each novel stands alone, but the relationship between Liam and Catherine—and their growing circle of family and friends—deepens from book to book.