Born in 1484, Luke Cahill was the oldest of the five Cahill siblings. His father gave him a portion of his master serum that enhanced his strategic skills. Luke, however, was not satisfied with this, and desired the entire serum. Just before the fire, he tried to convince Gideon to give him all the Clues needed for the formula, but he refused.
Though he rescued them from the fire, Luke's siblings blamed him for it and the death of their father. He became embittered against them and desired revenge. After he left Ireland, he joined King Henry VIII's court in England as the king's advisor. Courtly life taught him that nothing was out of reach as long as one was willing to use bribery, blackmail, and other forms of "persuasion." Luke began to send spies to track his siblings, telling them to do whatever it takes to find their Clues.
Before he went to London, there was a rumor that he had a diary containing what he knew, including what really happened at the fire. It is said that he gave it to someone he thought would be a good idea to trust; his sister, Jane. She hid it in an unknown location for a reason not explained in the books. Luke was the only one of the other four siblings that Jane got along with on occasion. He is the only sibling known to have confrontations directly with Damien Vesper and Madeleine Cahill.
"Revenge above all"
- Gideon Cahill - Father (deceased)
- Olivia Cahill - Mother (deceased)
- Thomas Cahill - Brother (deceased)
- Katherine Cahill - Sister (deceased)
- Jane Cahill - Sister (deceased)
- Madeleine Cahill - Sister (deceased)
- Louisa - (Sister-in-Law) (deceased)
- Winthrop Cahill - Son (deceased)
- Toyotomi Hideyoshi - Nephew (deceased)
- William Shakespeare - Great x2 Nephew (deceased)
- Keiko - (Sister-in-Law) (deceased)
- Madeleine the Matriarch - Great x2 Grandmother (deceased)
- Mary Arden - Niece (deceased)
- Every other Cahill ever to be born; all influential and famous historical figures for roughly the last 500 years.
- Wife (name unknown)
- All other Lucians
Appearance and PersonalityLuke Cahill is described as a thin, cruel looking man with dark hair like Dan. His sister Katherine referred to him as "sneakier than a serpent and even more deadly." He is also said to be at the wrong place at the wrong time by his Lucian fellow agents.
He appears on an old Irish portrait in the Paris Catacombs with his siblings.
In Venice, Amy dreams of his portrait back in France.
Gideon gives all the siblings their serums. Luke immediately takes his portion and in the evening comes to warn his father that Damien Vesper and his men are coming. After rescuing all the siblings he gets blamed for the fire by Katherine and Thomas and leaves to go to London. He later finds Madeleine and appoints her governess for his son, Winthrop Cahill. He eventually attempts to execute her, but she manages to escape.
- Strategy and planning (effects of the Lucian serum)
He does not appear online except on his card when you enter it.
- He had a dagger found by Sir Isaac Newton.
- He was the only Cahill child (besides Madeleine) who was certain Lord Vesper set the fire. It has been theorized that Jane believed this as well, due to her love and trust of Luke.
- He and his mother are the only Cahills to speak directly to Madeleine Cahill and Damien Vesper.
- He was the only Cahill child who was with Gideon for some time before his death.