Best ACT Prep Book?

I have taken the ACT once and got a 29 and was wondering what book would be best for me? I am retaking it in February

Hi. We have stopped using books and instead focusing on a few apps to try as they offer personalization based on the estimate scores and subject strengths and weaknesses. I have a Junior this year and just started looking into this. From his account, I had received an invitation to join as a Parent and started tracking his practice results. It worked well for his PSAT prep, which was just a few weeks of daily practicing. We are looking into the same app company, but for ACT right now.