There are 2 books in the The Innsmouth Legacy series. The newest book is Deep Roots which came out in 2018.

1
Winter Tide

Book cover of Winter Tide
Two decades ago the U.S. government rounded up the people of Innsmouth and took them to a desert prison, far from their ocean, their Deep One ancestors, and their sleeping god, Cthulhu. Only Aphra and Caleb Marsh survived the camps, emerging without a past or a future.

Now it's 1949,…
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2
Deep Roots

Book cover of Deep Roots
Ruthanna Emrys' Innsmouth Legacy, which began with Winter Tide and continues with Deep Roots, confronts H. P. Lovecraft's Cthulhu mythos head-on, boldly upturning his fear of the unknown with a heartwarming story of found family, acceptance, and perseverance in the face of human cruelty and the cosmic apathy of the…