[1] Vasser is the protagonist of the series, who begins to time travel, unable to stop or control the jumps.
[3] About ten years before the start of the series, Vasser was engaged to Deputy District Attorney Olivia "Livia" Beale, who he shared an apartment with.
[2] When Livia was believed to have been killed in an airplane crash, Vasser developed a gambling problem.
[4] Vasser begins to involuntarily time travel on his seventh wedding anniversary, at first thinking he is hallucinating.
As the series continues he finds out that Livia is in fact a time traveler like him, who was originally from 1948 and returned home just before her plane crashed.