Collins Brothers Books in Order

The Collins Brothers series grows out of the same extended family network that appears in the Slater Brothers books, so readers coming from that series will already know the Collins name through Aideen Collins. But it is easy enough to enter here fresh. The setup is simple and strong: a loud Irish family, a lot of sibling involvement, and romances that have to fight through past damage before they can settle into anything real.

This world is very contemporary and very family-led. Casey keeps the focus close to home, on apartments, jobs, daily routines, and the kind of siblings who show up whether you asked for them or not. That matters because the emotional shape of the series is not built on a big outside mystery. It is built on personality, chemistry, old wounds, and the way a whole family can either hold you up or get right in your face.

The series opens with Dateless, which follows Dante Collins, better known as Date, a charming mess with a long reputation for casual hookups and very little interest in settling down. He thinks he understands the shape of his life. Then Ina O'Shea moves in across the hall and quietly wrecks that certainty.

Ina is not looking for a whirlwind.

She has spent much of her life being managed, protected, or boxed in by other people, and moving out on her own is supposed to be the start of something steadier. That tension gives the book its core pull. Dante is used to noise, attention, and easy chemistry. Ina wants room to breathe and make choices for herself. Their relationship grows out of proximity, banter, and genuine kindness, but it also has to push through old habits, bad history, and the fear of trusting the wrong person again.

What makes the series feel bigger than one couple is the family atmosphere around them. The Collins brothers are not background wallpaper. Their work lives, loyalties, and running commentary shape the tone of the story, and Casey uses that group energy for both comedy and tension. There is warmth here, but there is also meddling, blunt honesty, and the sort of sibling involvement that can make a private moment impossible.

That blend is really the point.

Even with Dateless as the current doorway, you can already see the shape of the series: family-first romance, a very Irish sense of humor, and couples who have to learn that love is not the same thing as control. If you like romance that mixes chaos, heart, and a lot of people talking over one another, this is the Casey series that leans hardest into that energy.