Taltos is the fourth volume in the Vlad Taltos series but is chronologically the earliest in sequence.
This is a simple novel that details a very young Vlad and his first encounters with many of the recurring characters in the series. The text alternates between vignettes that precede each chapter, the main narrative about Vlad's journey to the Paths of the Dead, and anecdotal stories about Vlad's first forays as an employee in the (criminal) "organization" arm of House Jhereg. The three narratives come together by the end of the text.
By this point in the series, you'll likely only find yourself reading (and enjoying) Taltos if you've read the other books in the series. If you are a fan of the Vlad books, you'll find this a light but enjoyable addition that nicely fills in many of the gaps in Vlad's backstory.