The first book – or rather, series – that did this for me was John Connolly’s Charlie Parker series. It’s a crime series with a dash of the paranormal thrown in for good measure and since 1999, fans (myself included, although I joined the fandom much later) have been following Parker as he brings criminals to justice. There are several characters who have featured in every book and, as a result, reading the latest book always induces feelings akin to being reunited with old friends. In some respects I grew up with these characters and I love nothing more than being enveloped in their world once a year. It’s an annual event for me πŸ™‚