The Holly & Mark Mystery Books in Order

The Holly and Mark books open with a setup that knows exactly what it is doing. Special Agents Holly Frost and Mark Shepherd are sent to the town of Christmas, a place so committed to year-round holiday charm that it looks like it wandered in from a made-for-TV movie. Then a tourist turns up dead in the middle of the town nativity scene, and the joke becomes a real case.

The murder weapon is an icicle ornament, which tells you a lot about the tone right away.

Holly and Mark are not a cozy amateur sleuth pair. They are professionals, but they are also rivals, and their working relationship is already complicated by a past hookup they would both probably rather forget. That friction gives the story its pulse. One part of the appeal is the investigation itself, with suspects, local politics, and a ticking clock before the town's big Jingle Bell Jubilee. The other part is watching two very capable people try to solve a murder while pretending they are not distracted by each other.

Setting does a lot of work here. Christmas is not just a cute backdrop. The town depends on its festive image, which means every crack in that image matters. A place built on cheer, nostalgia, and tourist money becomes a pretty good place to hide grudges, bad decisions, and panic. That gives the mystery a fun contrast: bright decorations on the surface, pressure and mess underneath.

In tone, this co-written series looks lighter and flirtier than a straight police procedural, but it is not sugary. The banter is sharper, the romantic tension is stronger, and the crime element has real stakes. Holly and Mark are both on thin ice professionally, so the case is not just about justice. It is also a shot at redemption, and only one of them can come out of it with the promotion they want.

Since Home for the Homicides is the first book, it is the clearest guide to what readers should expect from the series. The main draw is the blend: holiday whodunnit, enemies-to-lovers tension, and two investigators forced to work shoulder to shoulder in a town that would very much prefer murder not ruin the brand. If that mix sounds fun, start at the beginning and lean into the chaos. This is a mystery series for readers who like their small towns charming, their detectives stressed, and their seasonal sparkle sitting right next to a dead body.