It is the winter of 1143 and all is not well in the court of Owain, King of North Wales: His future in-laws are untrustworthy; the Norman lords on his eastern border are restless; and among his wedding guests lurks a cold-blooded killer.

Hallowmas 1144. With the harvest festival approaching, Gareth has returned from fighting in the south, hoping for a few months of peace with Gwen before the birth of their first child. But when an innocent foray to the beach turns up the murdered body of Prince Hywel's long lost cousin, a woman thought to have run away with a Dane five years earlier, it is Gareth and Gwen who are charged with discovering her killer.

The year is 1143, and King Owain seeks to unite his daughter in marriage with an allied king. But when the groom is murdered on the way to his wedding, the bride's brother tasks his two best detectives - Gareth, a knight, and Gwen, the daughter of the court bard - with bringing the killer to justice.

Prince Hywel has called all the bards of Wales to him for a music festival to mark the third anniversary of his rule over Ceredigion. He has invited all the lords of Wales too, including his father, his uncle, and his neighbor to the south, King Cadell. But with the highborn also come the low: thieves, spies, and other hangers-on. And when a murderer strikes as the festival starts, Gareth and Gwen are charged with discovering his identity - before the death of a peasant shakes the throne of a king.

Determined to escape the gloom that has descended on Aber, Gareth and Gwen travel to Shrewsbury in an attempt to find answers about Rhun's death, about the whereabouts and plans of Prince Cadwaladr, and about Gwen's family ties to England. But when John Fletcher, now deputy sheriff of Shrewsbury, asks Gareth to help him investigate a pool of blood for which he has no body, Gareth can't refuse.

March 1147. Assassination, espionage, betrayal. King Owain has ridden east to confront King Madog of Powys with the attempt on the life of his son. Rhys, now abbot of St. Kentigern's monastery, hopes for peace and calls both Madog and Owain to the negotiating table. Peace, however, is the last thing on Madog's mind. Recalcitrant, self-righteous, and angry, he sees King Owain's recent weakness as his opportunity and knows that Owain's own barons are circling like wolves, waiting for the chance to overthrow him.

November 1147. Gareth and Gwen have again been called to a castle belonging to Robert, Earl of Gloucester, this time by Prince Henry, who insists his uncle was murdered. Allying with Normans doesn’t come easily to Gareth and Gwen, but initial doubts are swept aside as more losses come to light. Because Robert's death has upended the balance of power in England, friends and foes alike have a vested interest in keeping the truth from coming out, and it is up to Gareth and Gwen to stop the killer before he claims another victim - and maybe a country.

April 2022. When an unknown gunman sends David and William back to Earth Two, Michael, and Livia are left gasping along with the rest of their universe. Accepting that their respective employers are possible suspects, not to mention untrustworthy, the pair band together in the shooting's immediate aftermath, in an attempt to put the first few pieces of the puzzle together. But when an unexpected bout of time travel upends everyone yet again, Michael and Livia realize they are on their own, and this particular puzzle is one that they - and only they - can solve.

April 1294. With David returned from Ireland and Anna from Avalon, the time has come to confront the traitors who sought to assassinate David and take his throne. But before that can happen, David is tested yet again by his inability to account for everything or everyone in his life - and especially the magic that surrounds him.

With David and Llywelyn in Ireland, the rule of Wales and England has fallen to Math and Anna. Unbeknownst to them, however, rebellious barons have tried to assassinate David and thrown Ireland into civil war. When the treachery reaches across the sea and touches Anna, she finds herself at the center of a conspiracy that stretches from Dublin to Edinburgh - and only her actions and choices stand between her family and the destruction of everything they've worked so hard to build.

November 1288. Bereft of a king or rightful heir, England hurtles towards civil war for the second time in a generation. When David, Prince of Wales, and his wife, Lili, travel to London to attend the wedding of William de Bohun and Princess Joan, they have no intention of involving themselves in local politics. But as infighting leads to murder, David and Lili find themselves at the center of a far-reaching conspiracy.

March 1294. Ireland is at a crossroads. The different factions - Irish, Danish, and English - are tearing the country apart with their constant warfare. Hoping to hammer out a treaty, David calls the Irish Parliament into session. Unfortunately, some lords are far more interested in fighting than talking, and it isn't long before the conference goes awry. With the future of Ireland at stake, David finds himself caught up in a far-reaching conspiracy that puts not only his own life on the line, but his family's as well.

King David of England and King Philip of France face a holy war neither man wants to fight....

Anna has made a place for herself in 13th century Wales as a wife, mother, and healer. David has taken more of the kingdom's rule on his shoulders, even as his relationship with Lili has caused friction with his father, King Llywelyn. The King wants his son to seek a political marriage that will benefit his country - and possibly place the crown of England on David's head.

Christmas 1292. Time travel has meant many things to Meg, David, and Anna over the years. But regardless of the circumstances, it's always been about saving lives: their own, their family members', and their friends'. This time, it's a combination of all three.