The Fire and The Disappeared are books that could be read as stand-alones, but their characters overlap in The Disappeared as one of The Fire’s MCs brings together the MCs from The Disappeared, so it’s better to read The Fire first to follow the context in chronological order.
The Moments, Reality Check, and Love Forged are not connected to any other book, so they can be read in any order you choose.
Intro to the series. The MCs don’t start in Chicago, but they later move and are heavily featured in the series.
One of the featured characters in the Chicago Series moves to San Francisco in the last book, which gives way to a new branch, The San Francisco Series.
Keep Tahoe Blue is introduced mid-series for San Francisco, and is recommended for reading after Checking the Right Box and before Macon’s Heart as one of the four friends from Checking the Right Box moves to Lake Tahoe, starting The Tahoe Series, and it takes place before book #2 in The San Francisco Series.
The San Francisco Series ends with This Above All, and we are back to Tahoe:
Let Go slightly overlaps with Macon’s Heart through Macon Greene from The San Francisco Series, and for Macon’s back story it’s better to read Macon’s Heart first.
This series doesn’t overlap with other series and has the following books order:
This series is related by a sports theme, not by characters.