A Parting of Waves - Tome and Grim locations

When you get to the ship, continue along the normal path towards the Village.

The first tome is located underneath the 2nd wrecked ship you walk across.

Climb over the wood to reveal a hidden ladder and drop down and jump over

You will find the tome in a chest.

Located inside the whale guts, the player needs to hit it a few times to reveal the grimoire, this is right after the drop-down after the first tome.

You will see the whale directly after dropping off the ledge from the first tome, down on the sands, continue straight and drop down again, going around to the left to find the whale.

Pull the lever in the barn with the blue shield after Tome #1, it will be just above the docks.

Cross the wooden bridge that has dropped and grab the Key hanging on the key holder.

Head directly down to the sewers using the ladder (or a hole) and unlock the locked Sewer door closed to the East side / Ocean side (before crossing the walk-able Whale netting)

On the left side there will be a little jump, and then you will see a rock formation with mushrooms on them, jump up on them to reveal the Grimoire.

After you go through the village/docks, head through the barn and up towards the ship on its side.

After jumping up here and making a left at the top, you will find it in the chest underneath a big crane.

Once you reach the bridge with the hanging humans, continue on your right into the building.

Go up to the top of the building and you will find a break in the floor, fall through that to get the third tome.

- Credit to RavenTale for showing me Grimoire #1, Tome #2, Tome #3 and the comments for Grimoire #2 :)